BC Racing ZX Series Coilovers (True Rear) for 2012-2019 BMW 3 Series F31 Touring RWDBC Racing ZX Series Coilovers for the 2012 2019 BMW 3 Series F31 Touring 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 F31 Touring chassis and refined until it balances ride quality with performance the reason 3 Series F31 Touring coilovers from BC Racing are the best selling adjustable kits in their segment