I have one of the latest CMB .45RS motors and so far I love it. I'm not sure how it would do in a hydro but my Seaducer sure likes it. It's the smoothest engine I've ever had and the throttle response is incredible. In stock form with an AB Parabolic pipe it's as competitive as any of the modified engines I run against. It looks just like the 90 motor with zimmerman valve. I'd buy another one in a heartbeat.
Ron