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I'm going to start autocross soon and my car is stock. I am probably going to run in the stock class but I might want to upgrade my supsension a little bit if I can. Does anybody know which parts I can add to my car but still be allowed to keep my 3 year warranty. I don't care about intakes, exhaust, or turbos. But will adding a front and rear strut bar affect my warranty? I don't think it would, I don't see how it can hurt the car. What buying grippier tires, I'm almost positive you can do that. But if anyone else knows any other parts I can use to keep my warranty, that would be appreciated.