SuperPro SPF4195-90K Rear Trailing Arm Bushing Kit - Motorsport VersionSuperPro SPF4195 90K Rear Trailing Arm Bushing Kit Motorsport Version The Motorsport version of this kit steps the durometer of the material up from 80A in the standard kit to 90A. Due to the bushings location under the rear seats the higher durometer can bring more road and tire noise into the cabin as well as some additional impact harshness. The higher durometer material reduces deflection of the bushing under changing loads resulting in more