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Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Item # C56111
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Custom Fit Vehicle Wiring

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Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring. Powered converter reduces strain on wiring system and is made using SMT to ensure superior performance. 1-800-496-5010 to order CURT custom fit vehicle wiring part number C56111 or order online at Free expert support on all CURT products. Guaranteed Lowest Price and Fastest Shipping for Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (35)
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CURT Custom Fit Vehicle Wiring - C56111

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Powered Converter
  • CURT

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring. Powered converter reduces strain on wiring system and is made using SMT to ensure superior performance.


  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Connects quickly and easily
    • Locate connection points behind tail lights
    • Plug in T-connector
    • Run hot lead to car battery
  • Includes a tail light converter to ensure that your vehicle's wiring matches that of your trailer
    • Powered module connects directly to battery to avoid overloading vehicle's electrical system
  • Constructed using surface-mount technology (SMT) for consistent, reliable performance
    • Maximizes trailer light yield and intensity while producing minimal heat
    • Ensures superior operation in rough road conditions
  • Comes with dust cap for 4-way flat connector


  • Maximum amperage:
    • Stop/turn lights: 3 amps per circuit
    • Tail lights: 6 amps per circuit
  • Limited 1-year warranty


This custom-fit T-connector plugs into your vehicle's wiring harness, which is located behind the driver's-side and passenger's-side tail lights. You will have to remove the tail light assemblies to access this harness. Once you've plugged in the T-connector, run the hot lead up to your car battery. Connect the lead to the included fuse holder, and then connect the fuse holder to the positive terminal on your battery.

Once installation is complete, the 4-way connector will be stowed beneath your vehicle, near the trailer hitch. A mounting bracket (sold separately) is recommended to keep the connector secure.

It is recommended that you use a small amount of grease on all electrical connections - the plugs on your automobile and the 4-pole connector itself - to help prevent corrosion.

Powered Tail Light Converter with Surface-Mount Technology

A tail light converter is built into this T-connector. This converter is a circuit-protected, battery-powered unit that bypasses the electrical routes that are used by a basic wiring harness. As a result, there is virtually no draw on your tail light circuits.

Because most trailers run on a two-wire system - wherein the brake and turn signals are carried on one wire - the separate brake and turn signals from your vehicle's three-wire system need to be combined so they are compatible with the wiring system of the trailer. This converter combines the brake and turn signal functions of your automobile so that they run on one wire to properly activate your trailer's tail lights. Note: This will not affect how the tail lights on your vehicle operate.

Curt builds each tail light converter using surface-mount technology (SMT). This method of construction involves soldering electronic components directly to the surface of a printed circuit board. SMT eliminates the need for leads, which are used in older through-hole technology. The result is a circuit board that is smaller yet provides more routing area and that offers superior performance, reliability and durability.

Curt SMT Circuit Boards

Circuit boards constructed using SMT have been shown to perform better under rough conditions with excessive vibration than those made using the through-hole method. And where would vibration be more likely to occur than in towing applications? Curt converters also produce less heat, leading to increased durability and longer life. In addition, lower levels of resistance ensure better performance, especially for parts that operate at higher frequencies.

Each Curt circuit board is made using high-quality components that are pieced together in the most technologically savvy fashion, leading to greater predictability and reliability in functioning.

56111 CURT T-Connector - Surface Mount Technology - 4 Wire

Installation Details C56111 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C56111

Average Customer Rating:  4.5 out of 5 stars   (35 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring. Powered converter reduces strain on wiring system and is made using SMT to ensure superior performance.

2010 Subaru Impreza

Fantastic kit! Just like the video shows, this is a very easy install. The only pain was running the line up to the battery and avoiding any moving or hot parts.

Install took a little over an hour, with most of the time running the wire to the battery.

I installed to our 2010 Impreza wagon.

I did use electrical tape to loom up the wires (the black looks less noticable) and zip tied the wire along the hitch. Be sure you keep the wires away from the muffler which will get hot.


Awesome love the products my Subaru loves pulling my camper to New Hampshire and and getting hay weekly and yes my 2011 Subaru wrx pulls hard

2015 Subaru Impreza

Works perfect with my Subaru Impreza hatchback. I had my mechanic print the rear electrical wiring diagram for my car. I tapped into the 15 amp power supply at the trunk light instead of running under the car to the battery to get power.
I also picked up the hitch mounting bracket for the wiring:
It looks nice and clean and is always ready to tow my landscaping trailer.

Dane,Thank you for your review.It is important to run the power wire directly to the positive side of the battery and not any other power supply on the vehicle. This wiring harness is made for vehicles that have sensitive wiring and is designed to pull amperage directly from the battery. Failure to connect the power wire to the battery may result in damage to the vehicle wiring. I have attached a link to help with routing the power wire.
-- Etrailer Expert Heather A - 03/12/2018

2010 Subaru Impreza

Good kit and glad to have to get my trailer lights hooked up. Fitted my 09 Impreza great. Only 1 thing the sticky pad that attaches the relay box attached to the under said of the bumper well but it would not stay attached to the relay box. So the relay box kept falling off. So I ended up just wrapping it with electrical tape to the backside off my hitch and that works fine.

2011 Subaru Impreza

About 6 months after I installed this unit I started getting weird lighting issues with my car. I went out one morning and found my turn signal on without my keys even being in the ignition or the signal switch on. Then my brake lights stopped working and I was almost rear ended multiple times before I realized they were out. As soon as I remained the trailer wiring all my lighting problems were solved. The module must have not been to weather proof and failed causing my issues.

Subaru Impreza

This is not the easiest of installs because the Subaru Impreza/WRX isn't really designed with trailer lights in mind and apparently doesn't have appropriate power run to the back of the vehicle. So this kit requires one wire be run straight to the battery. That's easier said than done because the kit doesn't really tell you where to run that wire.

I certainly didn't want to use self drilling screws and hang the wire under the car, I could see that getting snagged on something eventually. What I did was drill two holes in the "frame" rail under the car to get the wire under the passenger cabin inside the frame rail where it will be protected. I supplied my own rubber grommets to protect the wire from the sharp holes I drilled. After the frame rail on the WRX there is a plastic gas tank protector that the wire can be run behind. It's tricky to find routing around the rear suspension and exhaust which you have to avoid too.

One other gripe I'll mention here is the tag on the harness kit clearly mentions you must put the electrical box inside the vehicle to maintain the warranty. At the same time the kit is clearly not designed to be mounted inside the vehicle, all the connections are outside and they don't provide any rubber weather tight grommets that would be required to get the wires outside to the box inside.

I wouldn't rate this a complete kit. Parts I needed that weren't included:
-Curt 57204 and 58300 brackets to hold the flat four connector
-Rubber grommets to protect wire from frame rail
-The hanging wire method requires the hangers mentioned in the video, which incidentally aren't available in any of the three major hardware stores near me.
-A bunch more zip ties
-Some wire loom would be nice
-Solder, heat shrink tubing and a small torch: please don't use crimp connectors under a vehicle, they corrode and make a bad connection eventually.

One year later and the wiring harness still works perfect.
Scott - 02/06/2016

2012 Subaru Impreza

Great kit. Plug and play. Very straight forward. Running the power cable to the battery is tricky, but that's no fault of the kit.


I've been happy with the wiring harness.
It works well and has been durable.

Subaru Impreza

It made it easy to hook up an Impreza harness, since Subaru did NOT provide an easy-plug harness (like they do on Foresters, etc). We had a minor problem due to our poor ground, but redrilled a hole and cleaned up the paint, and it worked w/a better ground.

Works perfectly after one year! We use it almost weekly.
Kevin K - 07/30/2015

Subaru Impreza

Our mechanic, who installed the products we purchased on eTrailer, reported that the hitch was good quality, but somewhat tricky to install on our Subaru Impreza. They had to drill custom holes in the car body to fit the hitch frame. They also needed to run the wires from the car battery up front through the interior of the car (through panels and the trunk) to reach the wiring harness for the hitch. The full installation will end up costing around $250 in addition to the $*** for parts. I was impressed with eTrailer's customer service with a single rep assigned to each customer!

2009 Subaru Impreza

Purchased the Curt T Connector about a month ago. Was asked to review the product. So here goes. I didn't get a chance to install it until today. First let me say I am an avid DIYer. I build or fix everything. So this was really a sweet product. I would rate it as anyone with simple hand tools can do a great job. First it was straight forward and installed just like it said. No issues at all. It took a bit longer than suggested as I need to run the power line and secure it to the unibody of the Subaru. Works great looks good as you can not tell it is there. The only real complaint is the electrical connectors, they are really cheap as I broke the first 2 I tried to crimp. So I just soldered the connections and used a blister wrap to protect the wires.

2011 Subaru Impreza

I like that I didn't have to hack into any wires with this system. It's almost completely plug and play. The only difficult part was running the power wire from the unit up to the battery. Crawling under my Impreza was really tight and I wasn't sure if the wire was near anything that would destroy it. So, i epoxied 4 metal hoops/rings (had them in my toolbox but you could get metal tubing at a hardware store and cut four short rings) along the frame rail underneath on the drivers side and ran the power wire through them. I still had to finagle the wire up and through the rear axle/exhaust area though.

2010 Subaru Impreza

This wiring harness works great. Installation videos from E trailer were very helpful. The instructions that came with the harness were not for my exact model. E trailer products and shipping were amazing as usual.

Subaru Outback Wagon

Great product, very easy to install. Installed on my 08’ Impreza outback sport. It is a true “plug and play” install, no wires to cut, just route the wiring harness and hook up the connections.

2011 Subaru Impreza

I bought the etrailer kit for a 2011 Impreza. The installation was a snap and after a year, it has never failed, the connector housing and weather cover have remained in good condition. I saved a lot by doing it myself, following the included, well written instructions.

I am coming back for any future wiring needs.

2010 Subaru Impreza

This harness was near perfect, the hardest thing was cleaning a spot for the control module to mount to. It's been a while since I installed this so the details are fuzzy but I don't recall any difficulties.
When I connected to my trailer everything worked, after I fixed a bad ground.

2009 Subaru Impreza

Looks like a good product however it was not what I needed. I mistakenly ordered trailer wiring instead of tow car wiring. It should have been obvious to etrailer that I was making a common mistake and questioned my purchase since I was also buying parts to tow that car instead of towing something with it. Now I have to eat the purchase and buy another correct part.

2008 Subaru Impreza

Great product. Install on my Subaru Impreza wasn't too bad once I drilled a hole and fished the hot lead through the firewall. Instructions were easy to follow, and I was happy that the converter came with an adhesive pad to hide it away behind the bumper without rattling around.


Install was pretty easty for the most part. Plug and play with the exception of running the 12V power wire from the battery back. My car had few places to run such a wire but it worked out. Overall it worked very well and I'm very pleased.

2008 Subaru Impreza

happy with the shipping speed. not so happy with the additional wires that need to be wired in was hoping to find a plug and play setup and this was all that was available.

2011 Subaru Impreza

Very pleased with! Shipping was fast and the product is high qualIty. The harness was easy to install except running the wire to the battery. There are not many good places to run a wire under the car, I ran mine inside. Overall great experience!

2009 Subaru Impreza

Initially I was hesistant to spend so much money on a plug and play unit when I can wire a standard wiring kit just fine, however, I’m glad I did buy this kit. The weather sealed plugs give me piece of mind that I won’t get corrosion in the connections down the road.

I would buy again!!


Overall pretty good. The appropriate amount of wire was sent, however the quality of the fuses and whatnot were on the low side. I ended up using my own inline fuses as well as my own double sided tape, even the zip-ties were cheap so I used my own there as well.


Great product, great service and a great experience. I will definitely be using this company again in the future. Product was very well made and super easy to install. Thanks etrailer

2008 Subaru Impreza

Worked great on my 2008 Subaru Impreza. Fairly easy to install with some basic tools. Had it installed for a year now and still works properly.

Show More Reviews

See what our Experts say about this CURT Custom Fit Vehicle Wiring

  • Installation of Curt T-Connector Vehicle Wiring Harness # C56111 on a 2008 Subaru Impreza
    To install the Curt T-Connector Vehicle Wiring Harness, part # C56111 on your 2008 Subaru Impreza you will want to make your tail light connections first and then attach the white ground wire to a good, clean ground on your vehicles frame. After those connections are made you will want to see where the converter box ends up being located and find a good spot that the converter box can attach to. Try to find a large enough area that will allow you to attach all of the double-sided tape on...
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  • Why is a Connection to Vehicle Battery Required for Trailer Wiring on a 2011 Subaru Impreza
    The 12 volt power wire on the Curt Custom Fit Trailer Wiring Harness, # C56111, is designed to provide power for the trailer stop, turn and taillights. This type of wiring harness is designed for vehicles that have sensitive circuitry and thinner wires that cannot handle the additional amperage draw that would be placed on them if trailer wiring was added. The converter box will use the vehicles circuitry to sense when the vehicle brakes, turn signals or taillights are activated and the...
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  • Wiring Harness Installation on my 2008 Subaru Outback Sport
    For your 2008 Subaru Outback Sport there is a different installation process than what the non Sport models have. You will also be using a different harness the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # C56111 is the correct harness for the Sport models. Instead of this one installing into a factory plug it will install behind both of your tail light housings and use the signals it receives from there to send the power out to the trailer through...
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  • Availability of T-1 Connector for 2009 Subaru Impreza Wagon
    Due do differences in the tail light assemblies on the Impreza Wagon, the # 56061 T-1 harness for the sedan will not work with the wagon. For the wagon model, you'd want to use the Curt # C56111 which installs as shown in the linked video. Routing that power wire isn't too difficult, I'll link to an article that explains the process.
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  • Troubleshooting Trailer Wiring Where Running Light Circuit Stays on but Dim
    What you described sounds like a shorted out converter box. Especially since you already checked the connections of everything as well. Best option is to replace the kit with a new one. We have found that the Tekonsha converter boxes are the most reliable so for your 2012 Subaru Impreza the # 118573 would be your best option.
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  • Trailer Wiring Harness for a 2014 Subaru Impreza WRX Hatchback
    I do have a trailer wiring solution for you but there are no T-connector type harnesses available for the 2014 Subaru Impreza WRX hatchback. But you can use a hardwire harness, # 119147KIT. I have linked a video review of this harness for you.
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  • Recommended Trailer Wiring Harness for a 2009 Subaru Impreza Hatchback
    Trailer wiring harness # 56061 is for Sedan models of the 2009 Subaru Impreza. For your hatchback you can use T-connector harness # C56111. Or you can use hardwire harness # 46255. Considering the T-connector is easier to install and costs less than the hardwire option I would go with it, # C56111. I have linked a video showing how it installs.
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  • Is A Trailer Hitch Available For My 2011 Subaru Impreza WRX 5-Door Wagon w/ Dual Exahaust
    For your 2011 Subaru Impreza WRX hatchback wagon, you will need the CURT Trailer Hitch Receiver, part # C11120, which fits the Wagon model with dual exhaust and quad exhaust tips.This CURT hitch is Class I 1-1/4 inch hitch, and includes a drawbar, pin and clip. To complete your towing setup, you may be interested in the following: Curt Wiring, part # C56111 1-7/8 Inch Hitch Ball, part # 19256 For hitch accessories such as bike racks, you will be limited to those that are compatible with...
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  • Trailer Wiring Recommendation for a 2015 Subaru Impreza
    At this time the only trailer wiring harness I can recommend for a 2015 Subaru Impreza hatchback is a universal kit like the part # 119190KIT that will hardwire to the vehicle. The part # C56111 is for older model Imprezas so I cannot recommend it for you. The Curt Hitch part # 11286 that you referenced has also been confirmed as a fit for your vehicle.
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  • Wiring 2010 Subaru Outback to Tow European Spec Trailer
    A European 7-Way trailer connector has the same functions that a US 4-Way has. We do not have an adapter or a harness made with a European 7-Way. If your 2010 Subaru Outback was made for the North American market then you can use the Curt harness, # C56040 if it's NOT a sport model or # C56111 for sport models. In order to get it to work with a European 7-Way, you would need to cut off the 4-Way end and then use another converter, # 118158 . You would attach the the white, green, and...
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  • How to Install a Brake Controller in a 2011 Subaru Outback Wagon
    If installed properly a brake controller like the Prodigy P3 # 90195 would not cause any damage to any components of your vehicle. If anything it will help preserve the life of your vehicle's brakes as it will help slow down the vehicle when towing a trailer by allowing the trailer to do some of the braking. This controller would not connect in any way to the braking system of your vehicle so it would not damage it. You will need to start with a 4-way (if you do not have one). For that...
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  • Will The EcoHitch Stealth Trailer Hitch Receiver Fit a 2012 Subaru Impreza WRX Aftermarket Exhaust?
    I reached out to EcoHitch to see if they had any fitment notes on your 2012 Subaru Impreza WRX with the Invidia R400 Gemini Exhaust. They were not able to confirm or deny that their Stealth Trailer Hitch Receiver # 306-X7261 will fit with that exhaust. I have linked an image below that shows where the receiver attaches to the frame so that you will be able to see the area where you may have clearance issues with your aftermarket exhaust. The Curt T-Connector Vehicle Wiring Harness # C56111...
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  • Recommended Trailer Hitch and Towing Equipment for 2010 Subaru Impreza Hatchback
    As long as it's not a WRX STi model, we do have a hitch available for your Impreza. I'd recommend the Draw-Tite Class I receiver, part # DT24959. A ball mount is not included and you'll need the # C56111 trailer wiring harness and the # 19256 for a 1-7/8 inch or # 19258 for the 2 inch trailer ball. The trailer coupler should have the necessary ball size stamped onto it. The hitch itself has a 2000 lb towing, 200 lb tongue weight capacity which does not necessarily mean that the vehicle...
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  • Replacement Hardware Kit for Hidden Hitch Trailer Hitch # 75673 for a 2010 Subaru Outback Wagon
    You will need the replacement hardware kit, # RHK. Enter in the hitch number and hitch manufacturer where indicated on the page and click add to cart and the correct kit will be assembled. I have also included a link to the installation instructions and a link to a video showing a typical installation. For wiring you can use # 118467 if your Outback is not a Sport model or # C56111 if it is a Sport model with single exhaust. For a ball mount, I recommend the etrailer ball mount kit #...
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  • Will CURT Trailer Hitch # C11120 Fit a 2011 Subaru Impreza Outback Sport with Single Exhaust
    I do have a trailer hitch that will fit your 2011 Subaru Impreza Outback Sport model with single exhaust, but Hitch # C11120, will only fit the WRX and STI models with quad exhaust. Instead, take a look at CURT Trailer Hitch # 11315. Curt lists this hitch as a fit for the 2011 Subaru Impreza single exhaust Outback Sport models. I have included a link to the installation instructions for you. If you plan on doing some towing, the hitch comes with a ball mount, pin and clip. For a ball...
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  • Recommended Trailer Hitch for 2011 Subaru Impreza with Single Exhaust
    As long as your 2011 Subaru Impreza is not the WRX or WRX STi models, we do have atrailer hitch that is a confirmed fit for your vehicle The Draw-Tite, part # DT24959, is specially designed for light-duty applications. This fully welded, custom-fit trailer hitch lets you tow a trailer or carry a bike rack or cargo carrier with your Subaru Impreza. You will need drawbar, part # 3593. For a 1-7/8" hitch ball use # 19256. For a 2" hitch ball use # 19258. For trailer wiring use # C56111. I...
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  • Flat Tow and Trailer Tow Wiring Recommendations for a 2008 Subaru Impreza
    The wiring kits used for flat towing are designed to receive signals while the wiring for trailer towing is designed for sending signals. The TowDaddy Custom Tail Light Wiring Kit # TD3003 that you referenced would get you halfway there but it actually fits a 2005 - 2010 Chevrolet Cobalt Sedan so you need to use different wiring. For your 2008 Subaru Impreza I recommend using the Tow Ready Tail Light Isolating Diode System # TR118821 for your flat tow wiring and then the Curt # C56111...
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  • How to Wire a 2011 Subaru Outback for a Brake Controller
    The 2011 Subaru Outback is not equipped with an under-dash connector for installing a brake controller, but a controller can still be installed using our Brake Controller Install Kit, part # ETBC7 if a 7-way trailer connector is needed, or # ETBC6 for a 6-way connector. The install process, although a bit involved, is pretty straightforward and can be completed by the average do-it-yourselfer. We have plenty of help available online through the website, through our experts, or by phone. Other...
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  • Trailer Hitch for a 2012 Subaru Impreza WRX STi Sedan
    We list only the Curt trailer hitch # C11317 that you referenced as a fit for the 2012 Subaru Impreza sedan WRX STi model. I have included a link to the installation instructions for you to view. The instructions do not exclude models with that light at the bottom center, the hitch receiver should be below the rear fascia once installed. Not all models appear to have that light but they do have the the same fascia design and at least a spot for the light so it does not appear to be an...
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  • Recommended Trailer Hitch Receiver And Towing Components For 2011 Subaru Impreza Outback Sport
    Your 2011 Subaru Impreza Outback Sport has a towing capacity of 1000 lbs and max tongue weight of 200 lbs. As long as you trailer and load is less than these numbers, you will not have any issue. If you have the single exhaust, I recommend the Draw-Tite Sportframe Trailer Hitch Receiver - Custom Fit - Class I - 1-1/4" # DT24959, but if you have the quad exhaust I recommend the Curt Trailer Hitch Receiver - Custom Fit - Class I - 1-1/4" # C11120. For a ball mount, I recommend the...
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  • Recommended Trailer Hitch for a 2008 Subaru WRX 5-Door Wagon w/ Single Exhaust
    There are only two hitches that will fit a 2008 Subaru Impreza 5-Door Wagon with Single Exhaust model. The best one is going to be the Draw-Tite Trailer Hitch item # DT24959. This hitch is custom fit and bolts to your Subaru with included hardware. This hitch and the Curt item # C11315 are both 1-1/4" hitches and are the only ones available for your vehicle. Your Impreza does not have the capacity to transport a 300 lbs motorcycle and the carrier. You will need to tow your motorcycle behind...
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  • Can Curt C11315 Class I Hitch Be Welded as Well As Bolted on 2011 Subaru Impreza 5 Door
    According to Curt, although it isn't necessary, their # C11315 class I hitch could be welded into place rather that bolted as the installation instructions state, or welds could supplement the bolts. However, doing so would void the hitch warranty. If you'll be doing some light duty towing with the hitch, you'll also need a trailer wiring harness like # C56111, a ball mount like # C45521, a hitch pin like # PC2 and a hitch ball like # 19256 for a 1-7/8 or # 19258 for a 2 inch ball. I've...
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  • Parts Needed To Tow a Trailer with a 2011 Subaru Outback Wagon Sport
    The ball mount that is recommended for use with the Curt Trailer Hitch Receiver part # C11315 when towing is the Curt Class II Drawbar part # C45519 which would then need to be combined with the 1-7/8" Hitch Ball part # C40001 or 2" Hitch Ball part # C40018 and the Hitch Pin and Clip part # F-4. Please note, you'll also need a trailer wiring harness to control the lights and for this I recommend the Curt T-Connector Vehicle Wiring Harness part # C56111.
    view full answer...
  • Fascia Trimming Required to Install Curt Class I Part # C11120 on 2011 Subaru Impreza
    The lower bumper fascia would need to be trimmed approximately 1-5/8 inches by 4 inches. You can get a better idea of the necessary trimming by checking the install instructions, and looking at the photo I produced for you. Remember the old woodworkers adage: Measure twice, cut once. If you were planning on using the receiver as a mounting point for a bike rack or cargo carrier, be aware that Curt requires the use of a stabilizing strap like part # 18050. Failure to use a stabilizing...
    view full answer...
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