Hapo: The reason that the MC Express kit is better then the others is it is intercooled, and comes with another set of injectors. Mr, Turbo and Hahn use nonintercooled systems with stock injectors, which a turbo Busa is only good for up to around 300 hp with the stock injectors. The BAD turbo does use an intercooler, but it also uses stock injectors and the intercooler is stuffed under the tank.
Dragabusa: Dont kid yourself into thinking that the Hahn turbo kit on Gary's bike is the same one you will buy from Hahn. I talked to Bill Hahn in Colombus and he said they have gotten 304 hp from the turbo kit he will be offering to the public, but it will not sell with that much hp, but it is good for that much.
Paul