Riva R4 Yamaha SVHO Supercharger Impeller (24+ LB Wheel)

The Riva new generation 'R4' supercharger impeller for the Yamaha SVHO Engine delivers incredible horsepower and torque throughout the RPM range. All new blade design produces increased boost pressure and air flow resulting in excellent acceleration and top speed. Precision machined from billet aluminum to exact tolerances and anodized to prevent corrosion. Installs quickly and easily into stock supercharger housing. Includes detailed installation instructions.

Key Features:

• More acceleration & top speed
• Constructed with 2618 U.S. Forged Aluminum
• Precision machining does not require "old school" post production balancing
• Anodized to prevent corrosion
• Made in North America

NOTE: For use with Stage 3 & Up modifications. Requires use of aftermarket Engine Management System, Upgraded MAP Sensor & Supercharger Shaft Upgrade Kit.

Boost Performance:

• 8.5 PSI @ 6,000 RPM
• 11.75 PSI @ 7,000 RPM
• 16 PSI @ 8,000 RPM
• 19.5 PSI @ 8,500 RPM
• 22 PSI @ 9,000 RPM
• 25 PSI @ 9,500 RPM