Fits the 2, 2X or SPX. This is the one upgrade that will make you say "wow, that was money well spent". I was stunned at the difference in performance with the pipe installed.

Even with the 21T installed you feel the 2X want to wheelie in first gear on slightest of inclines. Fast accleration through first gear, and no bogging down going into second, even with 21Tooth sprocket installed. If you are going to shell out $199 for the pipe, do yourself a favor and get the 21T sprocket to go with it. Scary fast.