BC Racing DR Series Coilovers Subaru Wrx/Sti 2015-2021These are the new DS Series Coilovers brought to you by our friends at BC Racing. BC Racing says that the new proprietary piston design offers increased damping force at low piston velocities while maintaining a linear damper feel at higher piston velocities. This is really beneficial in rapid weight transitions that are met at chicanes, high speed corner shifts, as well as auto x courses. These coilovers are a mono tube shock design with a digressive