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Riva Racing Stage 1 kit for Kawasaki Ultra 300X jet ski 73 MPH : 7.900 RPM This change provides maximum performance (+7 mph) thanks to easy-to-install air intake, exhaust gas and pump improvements. No internal engine modifications are required. The kit includes: RIVA Kawasaki Ultra 310/300 Performance RK13100 Power Filter Kit RKA Kawasaki Ultra 310/300...