You should be able to find parts at your LHS still. Call and see it they still have stock around. If you are going to race, you should look for a new ride. The RS4 you have is not competitive with the current models. If you are just wanting to bash and maybe do some drag racing, keep running it. You can get a .21 conversion at www.wolfpackradicals.com
. If you need certain parts, hit me up on PM and I'll check my parts box. I got and RS4-2, a Racer 2 and enough parts to build another.