The 2011 Ultra 300X boasts incredible power and thrust with a design that ensures typical Kawasaki reliability. A high-tech supercharger and Kawasaki’s Electronic Throttle Valve System help channel that tremendous power exactly where and how a rider wants it. And a race-derived hull means that the Ultra 300X delivers the sort of top-tier handling hardcore enthusiasts expect. Power and thrust are key ingredients in the Ultra 300X package, and the 1,498cc inline-four DOHC engine supports that recipe like no other powerplant in all of watercraftdom. (Not a real word, we know. But we get so excited talking about this amazing engine!) The Eaton Twin Vortices Series (TVS) roots supercharger, introduced just last year on the 300X, features twin four-lobe rotors and offers an impressive performance compared to its supercharger peers. Roots-type superchargers are known as fixed-displacement units, which produce large quantities of boost at all rpm, even right off idle, for a flat torque curve and usable, step-free power across the rev range. That’s a good thing.