A MOD TO YOUR CAR CAN ONLY VOID THE WARRANTY IF THAT SPECIFIC MOD IS THE SOURCE OF THE PROBLEM

So if you put on lowering springs and your radiator starts leaking, since the springs have nothing to do with the leak, you wont have any problems voiding the warranty.

 

A car manufacturer will not void your entire warranty, only bits and pieces of it as you mod. The only exception is if you tell your dealership that you raced your car, then you can kiss the whole thing goodbye.