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MagnaFlow Cat-Back Exhaust System Installation - 2012 Toyota 4Runner

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How to Install the MagnaFlow Cat-Back Exhaust System on a 2012 Toyota 4Runner


Today on our 2012 Toyota Forerunner well be installing the MagnaFlow Cat-Back Exhaust System, part number MF15145. Before we install the new MagnaFlow system were going to go ahead and test the old or manufacturer system. Well get an idea of what the exhaust sounds like under a load. Now weve installed our new MagnaFlow system and well go ahead and repeat the same process of putting it under load to see what the new exhaust system will sound like. To begin our install well first need to remove the old or manufacturer system. To make it easier to remove the system well go ahead and spray down the exhaust flange bolts with some spray lubricant. This will make it easier to remove later.

Next well take our spray lubricant and spray down each one of the rubber isolators. This will make it easier to remove. Now with each one of our hangers sprayed down well go ahead and remove the rubber isolator from the rubber hanger. Next well move up to where the wide pipe meets the exhaust pipe and remove the two spring bolts. Well hang onto these spring bolts as theyll be reused to install the new system.

Well go ahead and set them aside for now. Next were going to unbolt the tailpipe assembly from the front path muffler and exhaust pipe assembly. Well remove the two bolts that secure the two flanges together. As you remove these bolts its a good idea to get an extra set of hands to help you hold the weight of the exhaust as you take the bolts out. Now with both bolts out well go ahead and pull the muffler and exhaust pipe down and set it aside and then remove the tailpipe. Now with our old exhaust system out of the way were ready to start installing the new MagnaFlow Cat-Back Exhaust System. Ill start installing our new exhaust system.

Starting with the exhaust pipe itll bolt up to the ball flange reusing our spring bolts. Then we can go ahead and reinstall the rubber isolator to hold the exhaust pipe in place. Next well install the clamp that will secure the muffler to the exhaust pipe. Well slide the clamp under the exhaust pipe. Well follow that with our new muffler. Once we have the muffler on to the exhaust pipe we can reinstall the three rubber isolators onto the muffler hangers.

Note the heat shield stud just above the rear axle is long enough that it will make contact with the tailpipe. We recommend to use a rotary cut off wheel to trim the exhaust stud down flush with the nut. Well now go ahead and reinstall the exhaust. Now with our exhaust system in place we can start tightening it down. Once everything has been adjusted and secured were ready to hit the road. That does it for the install of our MagnaFlow Cat-Back Exhaust System, part number MF15145 on our 2012 Toyota 4runner.


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Info for this part was:

Employee Andrew K
Video by:
Andrew K
Employee Nicholas E
Test Fit:
Nicholas E
Employee Chris R
Video Edited:
Chris R

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