I could not be happier with this conversion. It has allowed me to have a very capable and competitive race bike at a fraction of the price of buying a new Ninjette. Some race organizations could say that this is not legal for a stock Ninja 250 class, but WERA has already blessed this as an acceptable bike (from what I was told by a WERA member). So far I have not had anybody protest this bike. But if a peson is looking for a fun trackday bike that can run with the fastest post-2008 Ninja 250s, then this is a great conversion!!!