Install body kits that required drilling holes on car body, then void the car body problem issue such as knocking noise, rattling noise and etc.

Change wheel or sport rims, spring and absorber, void the car suspension warranty.

Modification on engine, any parts from it, void the whole engine warranty. Any problem occur to the engine, handle yourself.

From the 3 matters above, you will understand that no matter which part you try to do modification, that part or section warranty will be voided.