Interesting, thanks for the info. I have a Fox twin-clicker on my FZR400 and I was able to set a lap-record on it at Willow Springs with it, but I always felt like the rear-end could be better, and have always been looking for something better. If I ever dust my old FZR400 off and try to get up to speed on it again I might have to look into getting a Penske. Thanks for the info!