Stock 2018 RXT-X 399 Avg. Speed 67.5 (67-68) mph @ 7850 RPM (Average after Speed limiter)
R&D 2018 RXT-X 300 Stage 2 Kit Avg. Speed 77-78 (78) mph @ 8100/8150 RPM

Description of Parts
R&D R2 ECU Speed Control Removed/R2 Advancements
Part #: 802-01502
R&D Aquavein Intake Grate
Part #: 113-95009
R&D High Performance Air Filter Kit
Part #: 203-00303
R&D Pro Series Billet Sponson Kit
Part #: 123-95113

Parts/Kit Overview

The R&D 2018 RXT-X 300 Stage 2 Kit delivers an impressive increase in acceleration and will add10 MPH top speed performance gain while improving overall handling, pump hookup, and straight line stability. The R&D Performer Kit maintains the integrity of “Stock Reliability” by keeping RPM’s low and pump gas friendly! The R&D Stage 2 Kit is very easy to install and is available at a reasonable retail price. Most parts in the Stage 2 Kit can be used individually as a “stand alone” product. The R&D R2 ECU will unlock an additional 3 pounds of boost! The R&D Sponson Kit will completely transform the handling of the Seadoo RXT 300 to an exciting new level of performance, a huge “bolt on” handling difference! The RXT 300-X with a R&D Stage 2 Kit installed is sure to deliver increased speed, and much improved handling performance.

R&D High Performance ECU Reprogramming Services
The R&D R2 ECU upgrade is one of the first performance upgrades that should be done to the 2018 RXT-X 300. The RXT-X ECU The R&D R2 ECU allows maximum boost pressure to be reached by overriding the O.E.M. internal GPS speed control, as well as has a slightly raised RPM Limiter segments, and slight ignition advancements. With 3 pounds of boost pressure over stock settings this will allow the Sea-Doo 300 engine to accelerate better and pull harder in the upper mid-range and top end with up to 10 mph speed gain. Whether you are a recreational enthusiasts or an offshore racers who is interested in more performance, the R&D R2 ECU Package is an absolute “Must Doo” Upgrade.

R&D Aquavein Intake Grate
The R&D RXT-X 300 Aquavein Intake Grate kit will keep your Sea-Doo RXT-X’s pump loaded, hooked up, and off the rev limiter to improve handling and top speed performance. Improved straight-line stability and smoother, tighter turning capabilities will be noticed instantly. Top speed improvements of 2.5 -3.5 have been documented by R&D customers in both flat and rough water conditions. The R&D RXT-X Intake Grate’s Race Technology Inspired Wing concept will efficiently load the impellor/pump at all speed ranges to promote maximum acceleration performance.

R&D High Performance Air Filter Kit
The R&D RXP-X 300 Pro Series Air Filter Kit was designed and developed exclusively for the 2018 Sea-Doo RXP-X 300. The R&D filter kit will unleash restricted low-end, mid-range and peak horsepower by entirely by-passing the OEM air filtration system. The R&D Kit includes a huge 4” “ snap on” rubber velocity stack that allows large 4” adaptor hose to be attached to the supercharger and cleanly run to the rear area of the hull to capture cooler and less restricted air. The R&D Pro Series Filter Kit has ZERO restriction to the supercharger through its oversized 5.5"x8" filter, which results in quicker acceleration and more power. The R&D Kit is super easy to install, and also allows quick and easy “Back To Stock” assembly if needed! Pt. # 203-00300

R&D Sponson Kit
The R&D RXT-X Pro Series Sponson Kit will increase top speed stability in rough water conditions, as well as add increased and improved turning performance. R&D has incorporated years of race inspired technology to keep the RXT-X 300 super stable at top speed, corner sharp and smooth, and increase acceleration from zero to 30 mph. The R&D Kit also allows some degree of inside lean handling performance the RXT-X 300 needs! The R&D Sponson Kit offers 2-position sponson blade adjustability, which will guarantee this kit to out-perform any other 1, 2, or 3 up. The R&D Pro Series Sponson Kit offers a smoother more predictable ride with much better low and high speed turning capabilities. Track tested and race proven! Kit comes complete with all hardware and instructions.

R&D Pro Pitch Solas 300X Impellers (RXP-RXT 300X-161mm series)
R&D offers New Custom tuned Pro Pitch Impellers, as well as services to the O.E.M. Sea-Doo 300 impellors to performance match RPM specifications necessary to allow performance kits to work to full “Top Speed” potentials. R&D Pro Pitch Tuned impellers meet the performance demands of the R&D Performer, Stage 1 -3, Offshore, and Pro Am stock Kits. Send your Impellor along with your ECU and have R&D re-work both at the same time! R&D also stocks Pro Pitch Impellers that are ready to ship anywhere in the world. Performance gains include reduced cavitation, increased acceleration and a 1-2 mph top speed improvement in rough water conditions.

NEW SOLAS Pro Tuned Impellers
Pt. # 133-11317 13/17 R&D Pro Tuned Impeller
Pt. # 133-11318 13/18 R&D Pro Tuned Impeller
Pt. # 133-11319 13/19 R&D Pro Tuned Impeller
Pt. # 133-11420 14/20 R&D Pro Tuned Impeller

Re-Pitched O.E.M Impeller
NOTE: O.E.M. Sea-Doo Impeller is a 4 Blade 14/20-21. R&D offers Pro Tuned Impeller services to the stock Impellor. Impeller services are 14/20, 14/19, and 14/18. Typical RPM gains are 100 up for every degree drop in pitch and speed gains typically are .5 to .75 MPH for each degree.

NOTE: R&D recommends the installation of an R&D RXT-X Surge Protection Kit offered, which will substantially reduce wear and tear on the O.E.M. supercharger clutch assembly. Automobiles with Turbo Chargers or Supercharges generally always include surge protection valves to protect the supercharger from harmful compressor surge. The R&D RXP-X Surge Protection Kit offered is Part # 613-95258.

NOTE: The R&D 2018 RXT 300-X Stage2 kit development, tachometer, and top speed information posted was gathered after an initial 5-mile warm-up to stabilize engine temperatures. All testing was performed exclusively with Chevron 91 octane pump gasoline at 500 feet above sea level. Ambient air temperature during testing in March was between 75 and 85 degrees. These test results may change as we continue to gather data, and monitor O.E.M. stock boat speed averages, and production impeller consistencies. The information posted in the R&D Performer Kit are averages. In many cases we hear of feedback from Sea-Doo owners with performer kit packages reporting of higher speeds than posted.

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