Mounts diagonally between the engine block and the frame rail preventing the forward and rearward movement of the engine/transmission assembly during launch and braking conditions. Without this kit, the movement of the engine within the chassis would cause the front and rear motor plates to flex and eventually crack. The use of two kits positioned on either side of the engine is highly recommend for high horsepower race cars. Includes a 3/4" dia. DOM steel tube, two chassis tabs, a 1/2" high misalignment rod end, an engine mounting tube and complete instructions. Improves reaction times. Fabrication and welding required.