neurokinetik works on his car, seems as if you wouldn't want to have to do that.
Once you've gone through the RS Xmod mods, there aren't too many drop-in applications ready just yet. There is the CF driveshaft, CF chasis(soon), CF braces(I think you can get them on ebay), and you may want to try a stock MiniZ motor(beware of the faster MiniZ motors or you may have to actually do some work on your car
).