These flutes also direct grease to the outer edge of the bushing, keeping the thrust surface lubricated. This efficient lubrication ensures quiet, reliable operation over the life of the bushings. In addition, the reinforcement braces strengthen the upper control arm frame mounts by tying the upper mounts and lower mounts together.BMR's suspension designed its Rear Suspension Kits to work well in street performance, drag race, and handling applications. The heavy-duty construction of the upper and lower control arms eliminate flex, giving you much improved repeatability on the street, starting line, or in the corners. BMRs polyurethane bushings are designed to be compliant enough to give you a comfortable ride and absorb NVH, while remaining firm enough to stand up to high loads of any performance environment. The bushings easily handle the high compression loads of aggressive launches and hard acceleration, yet offer plenty of articulation for great handling. The reinforcement braces provide additional strength to the rear suspension for a more responsive driving experience. This product is the perfect upgrade for the enthusiast looking to improve performance, while maintaining acceptable NVH levels and ride quality. When performance is a must, rely on BMR's suspension!BMR's suspensions Rear Suspension Kits are available in black hammertone and red powdercoat for long-lasting good looks. Installation time is about 4-5 hours. Proudly made in the U.S.A.!