BC Racing ZX Series Coilovers for 2000-2006 BMW 3 Series Convertible M3 RWD (E46 M3)BC Racing ZX Series Coilovers for the 2000 2006 BMW 3 Series Convertible M3 (E46 M3) 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 3 Series Convertible M3 chassis and refined until it balances ride quality with performance the reason 3 Series Convertible M3 coilovers from BC Racing are the best selling adjustable kits in