BC Racing ZX Series Coilovers for 2007-2015 BMW M3 Convertible RWD (E93) w/o EDCBC Racing ZX Series Coilovers for the 2007 2015 BMW E93 M3 Convertible (RWD) bring the same three axis adjustability as the race spec ZR Series with valving tuned for drivers who split time between street and track. Every kit is extensively tested on the M3 Convertible RWD chassis and refined until it balances ride quality with performance the reason E93 M3 Convertible coilovers from BC Racing are the best selling adjustable kits in their segment