And new for the RXP this year is a 155 horsepower engine option. Either way you'll be digging into turns and beating your friends across the lake with no mercy. 2007 Sea-Doo RXP (155 hp) NICE RUNNING MACHINE! Suddenly your shirt sleeves are too short. It's still the most powerful engine in the industry and has yet to get beat in the Musclecraft Shootout. Watercraft 2 Person 4559 PSN . the 215 horsepower supercharged intercooled engine is back in all its arm-stretching glory for 2007. There's simply no letting up when a PWC handles like this...