RIVA Power Filter Flame Arrestor is installed to increase airflow to motor. Power Filter mounts easily to original flame arrestor case and permits the removal of restrictive air plenum chamber and internal OE flame arrestor screens.

RIVA Pro-Series EFI Control Unit is installed. Unit provides easy adjustment of fuel delivery to meet the needs of modified EFI motors. Plugs directly into factory wiring harness connectors for quick installation.

RIVA Cat Removal D-plate is installed in place of restrictive catalytic converter increasin top-end speed while reducing under-hood operating temperatures and allowin the use of regular 2-stroke oils. A high quality stainless steel replica of the plate that is standard equipment on export model Yamaha watercraft without emission controls.

RIVA GP1300R Free Flow Exhaust Kit is installed. Kit replaces restrictive sound suppression system located between waterbox and hull exit reducing backpressure and engine operating temperatures.

RIVA GPR Pump Seal Kit is installed. Location specific molded inserts are siliconed in to the voids of the OE pump inlet shoe significantly reducing cavitation.

RIVA / Solas 13/20 'Set-Back' Concord impeller is installed. This impeller is specifically designed for the Stage I GP1300R (`03~04 models) application using a 87mm exit nozzle. Billet Impeller Cone is included.

Original 87mm Yamaha GP1200R exit nozzle is installed replacing the standard 85mm GP1300R exit nozzle. Larger exit nozzle compliments the 13/20 Set-Back impeller maximizing performance.

RIVA GPR Performance Ride Plate and Top-Loader Intake Grate are installed. Our ride plate and intake grate combo increase top speed and significantly enhance handling characteristics. Prop spin and cavitation found with the stock grate is greatly reduced along with the modified GPR's tendency to drop on its nose when the throttle is let off at high speeds.

RIVA GP1300R Performance Trim Tabs are installed in place of original trim tabs. Designed to trim craft up for increased top speed and serve as a quick fix to unwanted proposing. Tabs are 2.5 inches longer than stock.

RIVA GPR Pro-Series Adjustable Sponsons are installed. Sponsons dramatically improve the handling of the GP1300R with a superior blade design and mounting angle. Sponson depth is adjustable to accommodate any riding style.

NOTE: Stage I modification is for competition use only.