No, installing the MagnaFlow 4" Exhaust Tip # MF35181 would not void the warranty on your 2016 GMC Sierra 2500. If you are concerned because it is a weld-on then you could use # MF35187 if your existing exhaust pipe is a 4 inch. This one is a clamp-on. view full answer...
Loud exhaust noise on the inside, with a deep drone, sounds like it could be a system with glass packs or another modified exhaust system that has a straight through type of muffler. If you switch the straight through mufflers with chambered mufflers it will take care of that issue.
You will also want to check to see if there is a leak in the system somewhere, possibly ahead of the muffler and behind the headers. That happened to me once and it was horribly loud. A muffler shop should... view full answer...
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