I just installed the RcShox bearing rack. The fitment was great. Makes the steering so smooth and removed a bunch of slop. Cant wait to hit the track. New chassis, new RcShox rack and pistons. I put all of these on to address "issues" I had with the stock kit. I stock pistons were too "soft", the car felt top heavy and the rack was all over the place. I really think these changes will make the car better.