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Sea-Doo RXT-X 300 / GTX Ltd 300 2018 Stage 3 Kit

Product #: RS-RPM-RXTX300-18-3

Availability: In stock

Regular Price: $3,793.00

Special Price $3,550.00

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Performance Data

  • Stock (U.S. Model) 68MPH @8,000 RPM
  • Stock (Intl. Model) 72 MPH @ 8,000 RPM
  • Stage 1 76 MPH @ 8,000 RPM
  • Stage 2 81 MPH @ 8,300 RPM
  • Stage 3 83 MPH @ 8,600 RPM
  • Stage 3 PLUS 85 MPH @ 8,800 RPM

Note: All testing performed with 1/3 tank of fuel.

  • RIVA MaptunerX BRP Bundle (All except SPARK) RS110SC-B
  • Bosch VT1100 Fuel Injector Kit VT1100-INJK
  • RIVA Sea-Doo 2018+ RXT/GTX 300 Power Filter RS13120
  • RIVA Sea-Doo 230/300 Intake Manifold Upgrade Kit RS12140-IMUK
  • RIVA Sea-Doo 300 XX Charger RS17140-135
  • RIVA Seadoo 4-Tec Valve Retainer Upgrade Kit RS19050-SRU-1
  • RIVA Sea-Doo 2018+ RXT/GTX 300 Free Flow Exhaust Kit RS16120
  • RIVA Sea-Doo 4-TEC Catch Can/Engine Breather Kit RS19050-BCC-2
  • Solas Sea-Doo Concord SXX 13/18 Impeller SXX-CD-13/18


This kit delivers an awesome level of performance (+13mph on U.S. models) through easily installed electronic and air intake components. No internal engine modifications are required.

1) RIVA MaptunerX BRP Bundle is utilized to reflash original ECU. MaptunerX provides ability to quickly and easily load performance tunes directly into your stock ECU eliminating downtime that results from shipping for programming. Performance Tunes are calibrated to provide optimum fuel delivery, ignition timing and rev limit to compliment RIVA Racing Performance Kits. OEM dash display, engine diagnostics & engine safety functions are retained. MaptunerX features a full color, touch screen display, ability to restore stock tune settings and access to RIVA's RIVA's complete tuning library and technical support.

2) Bosch VT1100 Fuel Injector Kit is installed. High performance 1100cc fuel injector kit supplies modified Sea-Doo engines with the necessary amount of fuel to produce reliable horsepower.

3) RIVA Power Filter Kit is installed. The 300 Power Filter feeds your supercharged engine a steady diet of cool air delivering greatly improved acceleration and power. Replaces restrictive stock air box with a high-volume, precision-formed intake duct that attaches to the supercharger via a large 4” adapter. Cool air enters the system via an over-sized K&N filter element. Simple installation & quick removal allow easy access for engine maintenance. Includes water-repellent pre-filter and detailed installation instructions.

4) RIVA Catch Can/Engine Breather Upgrade Kit is installed. Easy to install catch can/oil breather eliminates power-robbing crankcase fumes and oil vapor from your engine's air intake. Increases horsepower by removing the engine's requirement to burn relatively non-combustible oil. Also improves intercooler efficiency by preventing the oil sludge coating that lowers thermal efficiency.

5) RIVA Intake Manifold Upgrade Kit is installed. Removal of restrictive screen element from inside of intake manifold enables your engine to produce more horsepower through increased boost pressures (+1lb). Special o-ringed, billet block-off plug with integrated fitting for aftermarket boost pressure gauge fills opening left after removal of screen element.

6) RIVA 300 XX Charger is installed. High performance billet impeller & 3MM spacer increase horsepower through superior impeller blade design and larger interior housing volume. Spacer & impeller install quickly and easily onto stock supercharger base plate delivering 17.5 psi of boost pressure.

7) RIVA Stock Retainer Upgrade Kit is installed. Titanium valve retainers increase reliability of modified engine by reducing the possibility of valve float at high RPM. To ease installation of Valve Train Upgrade Kit we offer a unique Valve Compression Tool that allows installation without removal of cylinder head saving you time and money.

8) RIVA Free Flow Exhaust Kit is installed. Kit allows removal of restrictive sound suppression system located between water box and hull exit. Improves engine performance by reducing back pressure & restriction.

9) The Solas 161mm 3-blade 13/18 Concord Impeller is utilized in this kit. This impeller increases low-end thrust and top-end speed while maintaining correct target RPM for the Stage 3 kit. Constructed of high strength stainless steel, Solas Impellers feature a polished hub and exclusive hub-end water seal for reduced cavitation.

Sea-Doo and RIVA both strongly recommend the use of premium octane (91+) pump fuel in your craft.

Additional Info

Additional Info

Product # RS-RPM-RXTX300-18-3
Manufacturer Riva


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