Yep, I love mine! It looks great but the low end torque is excellent! I've got a 44 tooth sprocket on the back and with WOT and a bit of pedalling you really have to hold on quite a bit from the acceleration. Each expansion chamber is tuned perfectly to the engine it is designed for, so you cant just stick on any old pipe, your best bet is fitting a pocket bike pipe to it if you have a 48cc, thats your closest bet.
Fastboy