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This impeller delivers unmatched acceleration & top speed in Yamaha FX/FZ SHO applications. The "R" Series impeller is precision tuned to RIVA specifications using a pitch block fixture. This offers a higher level of consistency when matched with RIVA Performance Kits. Includes billet impeller cone that locks solidly into place with 3 stainless set screws. Ideal for RIVA Stage I applications or higher levels of modification when matched with RIVA Pro-Series Reduction Nozzle.