This product has greatly improved the stability of the rear of my 350Z race car during operation. However, the large rear hub was so worn out that it could turn sideways and I had to push it in again and again. This only happened about halfway through the racing season. It was so loose that I just deleted it before it broke down and caused a big problem. Disappointed with this design. This could be prevented by some sort of washer or other design of the metal center piece. Given the cost of this kit I would expect more engineering as the polyurethane bushings alone clearly don't justify the price.