I would log on to dirtbike or dirtrider and read the pipe shootout. You will be surprised that the pipes don't do much more then the stock crf pipe. Most of them will cause a loss of power some where in the power band. I would suggest you go up to a 51 or 52 tooth rear sprocket(Not aluminum) those bikes are geared WAY to tall for the sand. I bought a warp 9 wheel, complete, ready to bolt on with a paddle for 330.00 at cyclegear on sale last year. Good luck!!