Quote:
Originally Posted by BuLoOoSki
there is no aftermarket performance parts that wouldnt void your warranty besides dinan, but like others said, you can save up and get a 335i, or forget about your warranty and mod your car, but honestly i wouldnt do that because for the 328 you will spend a lot and probably not gain much. i'm not sure about the 328 mods but i believe they have exhaust, intake and tune. These 3 will cost you 2500 and your gains are what 35rwhp?
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Dinan parts are not exempt, they instead offer their own warranty.
A dealer cannot void a warranty unless there is without a shadow of a doubt the defective part/failure was cause by an aftermarket part. Reading up on the Magnuson-Moss Warranty Act will bring you up to speed on your rights.
Keep in mind, this is not a "ace up your sleeve", but information you should know in case you are involved in a similar situation:
http://en.wikipedia.org/wiki/Magnuson-Moss_Warranty_Act