I have one that was getting hairy, causing my bike to lug and hesitate when very slow acceleration was applied around 4,000 rpm. Only happened with slow acceleration like going up hills or passing someone. However, if you wanted to go balls to walls it is amazing the difference in power. Most of my riding is just cruising so I took it off if your interested I could let you have it for $100. It was mapped for the Muzzy full exhaust and aftermarket air filter. I tried uploading a new map still did the samething. PM if interested.