I was deciding to get some mods for my 99' TL. I just got an extended warrenty on it. My TL has full oem body kit, every external and interior lights replaced with white/blue lights, and 16in TL chrome wheel (I also just ordered the S-type taillights). Now I want some mods to increase performance, but I know some mods would void my warrenty. Seeing as I just got an extended warrenty, I don't want that. Can anyone suggest some mods that would let me keep my warrenty? Someone told me comptech headers doesn't void your warrenty is that true? List of non-warrenty void mods would be nice.

 

They cannot void the warranty unless they can prove the aftermarket part in question caused the failure.