Coilover kit - BC Racing - V1 Series - iQ 1.0 & 1.3V1 Series BC Coilover kit for iQ 1. 0 & 1. 3 30 position damping adjustment adjusts both bump and rebound together. The V1 series BC coilovers use a large 44mm diameter piston in a 50mm diameter damper body to maximise oil capacity and reduce oil temperature and viscosity change. Ride height adjustable the lower mount can be wound up or down the damper body to allow ride height adjustment. The lower spring platform of the BC Racing coilovers are