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The H&R Sport Spring kit for 2004–2011 BMW 645Ci/650i Coupe E63 models with Dynamic Drive (non-convertible) lowers the vehicle to reduce fender gap and the center of gravity for improved body control. The progressive spring rate minimizes roll while preserving ride comfort and can help marginally reduce wind resistance. Constructed from 54SiCr6 spring steel, shot-peened and block-set, these lightweight German-made springs are a popular single-part handling upgrade.
H&R 04-11 BMW 645Ci Coupe/650i Coupe E63 Sport Spring (w/Dynamic Drive/Non Convertible)
