it also depends who installs aftermarket parts... aka trd parts installed at the toyota dealership are usually covered under warenty, they installed it so they are to blame if it breaks or breaks something...
It's such BS that Toyota dealers actually say "TRD
parts won't void your warranty. NO after market part voids your warranty, unless it causes the problem. The only real advantage of having TRD
parts installed by the dealer is that the part itself is then covered by the car's warranty.
It bugs me how many people come on here and say "if you install a CAI
it voids the warranty". Uh, no. And to the statement above "every single after market part voids the warranty"... does that include fuzzy dice? Think about it for a second.