Our Sea-Doo 300 drop-in supercharger impeller delivers 17.5 PSI of boost at 8800 RPM. Precision CNC machined from aerospace grade 7075 aluminum alloy and anodized in black.  Included is a laser cut spacer also anodized in black to complete the package. Equivalent boost and performance to the ET-135 and Riva 300 XX superchargers. Installation Notes Impeller is made to fit tight on the shaft. Using a heat gun on high setting heat up the area around the center of the impeller for 60 – 90 seconds. Once heated it will slide onto the shaft without requiring any force. Do not use a open flame tool like a torch as it can overheat and damage the impeller. Purchase on eBay You can purchase this item from us on eBay but it’s less expensive buying it on our website.