If you are REALLY worried about the warranty then get the BMW perf susp. Those are probably not low enough for you, though.
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M Perf Exhaust | Perf Steering Wheel | ModeCarbon CF V1 GTS Front Spoiler | ModeCarbon CF Side Skirt Extensions | ModeCarbon CF LM Series Rear Diffuser | OEM CF Perf Mirror Cap | OEM CF Perf Spoiler | Lux H8 160 Angel Eyes | Extended Billet DCT Shifter Paddles
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