As you can see, the fastest bikes I have seen Have the Tilly on them, But, They are not for novice tuner.And with the Mikuni you have to have a hand full of jets, so I guess its what u want,and what u are using it for. I think the Mikuni is more of a "all around" kind of carb. The Tilly will have more make more power and is a straight racing carb. This is from what I have seen and herd, not saying it is true.:thumbsup: