It runs fine, huge improvement over the stock pipe. Honestly I don't think it would fit if it weren't bent so I don't know. We lightened his (My brother) rollers, his belt is way loose though and the contra spring is toast...... acceleration is for crap but once it gets to about 30MPH you need to hold on :w00t: It fiving rips now when the RPMs are in the powerband. Spring and belt are on order, the pipe will stay. It was a bitch to fit right. The exhaust ring around the end of the pipe was bigger then the exhaust port, we took it off and grinded the end of the pipe flush with the header for a tight fit. The Leo Vince is a nice pipe, wish they made one to fit my Kymco.