2012 sierra denali replacement muffler

[Isriam]

Any suggestions on a 2012 denali replacement muffler? I have heard/read that it is a 3.5" pipe? Not sure what style is needed and just looking for some info. I just want to do a straight muffler swap with maybe a turn down.

[mymaggiebell]

i have been looking too! cant seem to locate a borla gmpp drop in with a 3 and a half inch, for a simple muffler swap. i did find a borla universal sport models, but i am worried about warranty. g.m. seems to frown upon any improvements without their stamp on it!

[tobias]

A new muffler will not void your warranty.

[mymaggiebell]

as ridiculous as it is, i was talking to a service manager, and he said that intake, exhaust and the like, change things (back pressure etc) and if there was a problem, it could void it. i of course looked at him like he had three heads!! this even included a resonator delete!!

[tobias]

Revised: A new muffler will not void your warranty if you aren't a dumbass and rig up some oddball, restricted setup.