Part No RY17040-SCI-B1 SC Impeller 11.5psi - Part No RY17040-SCI-E1 SC Impeller 16psi: Riva Racing released the ultimate (drop-in) performance supercharger impellers for the Yamaha 1.8 liter SHO Engine! Working closely with Vortech Engineers, Riva designed these impellers to deliver more horsepower and torque throughout the RPM range resulting in excellent acceleration and top speed. Investment cast from an extremely strong, lightweight proprietary aluminum and CNC machined to ensure exact tolerances. All new blade design is optimized aerodynamically and precision balanced to deliver smooth operation. Installs easily into stock supercharger housing with no modifications required. Includes detailed installation instructions. B1 produces 11.5psi @ 7,700rpm, E1 produces 16psi @ 8,000rpm, Note: Both impellers require use of aftermarket engine management system for proper calibration. Available from Hot Products USA.
