Front 2.5 Factory Series Coilovers feature bolt-on Factory Series Coilover Reservoir shocks that provide improved damping in any terrain. Coilover shocks provide suspension damping and suspend the weight of the vehicle. The integrated coil spring can be adjusted for preload and ride height and come pre-set to level your vehicle right out of the box. Experience for yourself the incredible performance and precise control that Factory Series Coilovers Reservoir shocks deliver. External reservoir keeps oil at optimal temperature for operation.