The BC BR Type Series Coilover Kit utilizes enlarged shock absorber cartridges with specially designed shock pistons and rods to provide a broad range of damping force. The newly developed lubricant oil used in all BC Racing shock absorber cartridges assists in minimizing aeration and cavitation. The beveled edge design on the lower locking ring ensures and optimum seal with the lower mount and prevents the lower locking ring from unseating.

The Pillowball Top Mounts are aimed at cars seeing frequent track use as they are a metal on metal bearing and are prone to making a knocking noise on some surfaces. These will have a camber top where available.

The Rubber top being the opposite being used for cars looking to mainly be used on the street or for cars not wanting the noise a Pillowball mount can bring.