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Coilovers are the only way to go but someone needs to be able to crack the BMW EDC module and interact them with the factory controls. Lowering springs will definitely hurt ride quality.
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'13 M5 (Sold), '10 GT3 RS, '09 GL550, '08 GT3 - (Gone), '07 997TT - (Gone), '06 C2S - (Gone)
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