It will only void your warranty if they can prove that the aftermarket exhaust caused whatever malfunction that you took the car into them to repair.
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E90 335i, Sparkling Graphite, Black Dakota leather, Burlwood trim, 6MT, ZSP, ZPP, PDC, Comfort access, heated seats, Navi w/iDrive, Production finished 10/6, Delivered 11/22/06.
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