I saw a video on YouTube where a guy swapped out his muffler for a Aeroturbine AT3030 on a 2015 5.0. Everything else was left stock. I thought it sounded pretty good. My question is will it void any warranty coverage if you change out exhaust parts?

 

By law if the dealer can prove the part you replaced cause the failure then yes.
If you have a problem with your powers teeming pump the exhaust could not possibly be the culprit so they would be hard pressed to void anything.
That being said, I won't make any promises they won't find a way.

 

muffler swaps are pretty common and shouldn't really void your warranty...unless of course you start pulling off the cats, but a cat back system shouldn't void your warranty...lot's of us do this mod...good luck!

 

To OP, what muffler did you get? Another option is the MBRP muffler, mbrp – 4wheelonline.com. It’s louder than Magnaflow but not too loud when cruising. Borla mufflers also have a nice rumble.