BC Racing ZX Series Coilovers for 2006-2010 Infiniti M35/M45 RWD (Y50)BC Racing ZX Series Coilovers for the 2006 2010 Infiniti M35 M45 (Y50) 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 M35 M45 Y50 chassis and refined until it balances ride quality with performance the reason M35 M45 coilovers from BC Racing are the best selling adjustable kits in their segment worldwide. ZX Series kits