I have this bike with the old pipe posted on this forum http://motorbicycling.com/f15/only-frame-remains-9038.html. I have a new style pipe (for me) which is a significant improvement. The new pipe is much larger in diameter and longer than the old pipe. It added noticeable torque and much more top end speed. I guess the design of the new pipe "suits" my set up better. This is the only scientific explaination I have. According to my speedometer I realized a 5mph improvement with the new pipe. I also climbed a hill in third gear which I barely made it up in first before. I bought the pipe for $59.00 on sale on ebay. It retails for $179.00
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