Originally Posted by z28lt1
Any mod that doesn't include consumables (tires, fluids, brake pads, etc...) can void PART of the warranty if the dealer in conjunction with GM wants to get picky. For some mods, its not very likely, but don't make any blanket assumptions. Take your CAI. Let's say the transmission blows up. If GM wanted to, they could say your CAI added 15 HP to the car. They designed the transmission for 580, and you now have 595, so they aren't warrantying the transmission. Is this likely? Probably not. Is it possible? Sure.
And unfortunately, you need to ignore all the internet lawyers who say GM has to prove the mod caused the issue. Technically, this may be true. But GM has a few things going for it you don't:
1: Lots of money
2: An army of lawyers
3: An army of engineers who can testify to design specifications
So it's not likely you'll find it financially beneficial to fight them long-term.
That said, if I put my common sense hat on, and if I was trying to come up with a general rule it would be: do not touch the tune, the supercharger, or the engine/transmission internals. Exhaust, intake, suspension, and the like generally don't cause significant problems -- although parts may still be effected. For example, if you put on headers, don't 100% expect your mufflers and cats to be under warranty any longer, even though some dealers may certainly repair/replace those under warranty.
Again, there are plenty of mods that should be "safe", but no one can guarantee it. Exceptions, of course, might be GM performance parts installed by a GM dealer. Otherwise, we go on the experience of others and some good faith, and hope GM doesn't have a change of heart and act like some other manufacturers looking for a reason to void warranties...
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