Our 20 PSI Yamaha SVHO drop-in supercharger impeller delivers 20 PSI of boost at 8550 RPM. Precision CNC machined from lightweight aerospace grade 7075 aluminum and anodized in black. Equivalent boost and performance to the Yamaha SVHO ET-20 and RIVA20 supercharger impellers. Yamaha Waverunner SVHO FZS FZR FX GP1800 Purchase on eBay You can purchase this item from us on eBay but it’s less expensive buying it on our website.