Sure for the couple thousand dollars difference between a M-sport 335i and a stripper 335is, you could buy enough mods (JB, exhaust, etc) to kick the shit out the 335is, but imo, the extra power, extra cooling, and the body bits is worth at least a grand to me and still having a WARRANTY is worth the rest.
And I know everyones going to say, just remove everything when you go to the dealer, but honestly, its worth avoiding the hassle and completely avoiding any chances of a mishap.
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