Slapped this pipe on a little bike and it made a huge difference in the power it was making even manages to do some good wheelies with me on it and i weigh about 190. Sounds like a big bike now.
The Mini Powercore 4 is the best bang-for-your-buck performance bolt-on for your mini. Offered as a standard Mini Powercore 4, Closed Course Big Bore System or as a Spark Arrestor Version, the Mini Powercore 4 features a Hi-Flo stainless steel core and formed end caps, an aircraft-grade aluminum canister and a durable stainless steel header. It's pounds lighter than stock and you will swear the motor has been bored and stroked with the first twist of the throttle.
Note: For closed course competition use only. Not intended for street use.