Warranty stuff depends a bit on your location. When replacing an exhaust in the US, everything would still be covered under warranty other than the parts you replaced/modified. If the new parts cause a failure then they don't have to cover it, but near zero odds that replacing a muffler could cause failure of anything else.I was wondering i got the car last week and i don't like the sound of the exhaust can i bring it to a shop and preform a muffler delete and put a magnaflow tip? will this void my warranty? i got the 8 year extended warranty. thanks for replies.