Currently I am not sure of the millimeter gain, allthough I can ask my mechanic if you want specifics. I have only put about an hour on the build so I haven't got on it hard enough to see what it can do. At the moment the bike is at Pro Marine due to the fact my friends wife is the manager and we have a little track there. FYI, It's in Palmetto which is about 5 mins over the Skyway. If you would like to see it you can meet me there or I can bring it home. Another thing you may want to know is that the guy that built the bike is the one that his wife works where the bike is so he would be there if you have questions for him. He builds world championship boats and spends his off time building bikes and riding. If you want to see his work for shits and giggles goggle the name Lightning Strikes. 04' Offshore World Champion. I only point this out so you don't think it was done in someones back yard. The bike was built to be fast, and it is.