Pulled this info from the jetski that uses the motor, the new ZX-15 will use. EATON TWIN VORTICES SERIES (TVS) ROOTS-TYPE SUPERCHARGER • Four-lobe design offers significant performance increase over standard roots-type unit • System force-feeds the engine two liters of air with every revolution, providing a stable supply of high-pressure intake air at all rpm • Planetary gearing increases supercharger speed by a factor of 2 for better response • Delivers compressed air continuously, not in waves, for smoother power delivery • Produces large amounts of boost even at low rpm for instant and powerful acceleration right off of idle • Provides a very flat and meaty torque curve with step-free power across the entire rev range without any of the lag associated with turbochargers • Produces more low-rpm boost than competitive or aftermarket systems, with a maximum of 17 psi of boost pressure • Two different air bypass valves are used to prevent over boosting at low and medium rpm