Barnett clutches are for use in super high horsepower applications. I bought one for my Gen 1 bike and never used it, they work in the Gen2 bikes too(so I saved it). I was told they are too grabby for comfortable use on the street. APE advised me that the C/F ones are a little more forgiving so that's what I bought, I had intended to use it with a turbo. If the OEM clutches are nearly as expensive and you want to go with a power adder, go with the Barnett.