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Sea-Doo GTX 300 Tuning: Comfort model with noticeably more punch

Jul 13, 2026

Sea-Doo GTX 300 Tuning: Comfort Model with Noticeably More Punch

The Sea-Doo GTX 300 is the comfortable all-round model of the 300 HP platform. Those who want more punch here use the same stepped tuning concept as the sporty 300s.

The Stage Principle

The concept is built in stages. Stage 1 is purely software-based via flash, from Stage 2 hardware modifications are added, and in the higher stages up to Stage 3, the package becomes more extensive. This allows the GTX 300 to be upgraded in clear steps and according to one's own requirements.

Suitable Hardware

On the hardware side, the Titan Retainer for Sea-Doo 300HP set relieves the valve train and is designed for higher RPMs. Additionally, the Blow Off Valve Kit incl. Charge Air Hoses for Sea-Doo 300 and the M-JET 4 Inch Intake System for Sea-Doo 1503 & 1603 Engines ensure clean boost pressure and increased airflow, with the intake system explicitly supporting the GTX 300.

Software, Diagnostics and Maintenance

The software side is handled by the M-JET Flasher for Sea-Doo vehicles, and diagnostics by the M-JET DIAGNOSTIC - Diagnostic Tool for BRP. For long periods of inactivity, the M-JET CTEK Charging Adapter for Sea-Doo Vehicles is recommended.

Conclusion

The GTX 300 combines comfort with real potential. With staged tuning and suitable hardware, the cruiser becomes a noticeably more powerful model.

Previous
Sea-Doo RXT-X 300 Tuning: Touring Power Based on the 300 HP Platform
Next
Sea-Doo GTR 230 Tuning: Upgrading the Entry-Level Performer with Flash and Intake

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M-JET – Plug-and-Play Performance & Diagnose über den Diagnose-Port, Steuerung per Smartphone, in wenigen Minuten startklar. Der M-JET Flasher ist kompatibel mit allen Sea-Doo Spark sowie Sea-Doo RXT-X, RXP-X, GTR, GTI, Wake, GTX und weiteren. Ergänzt wird das System durch die M-JET Module (z. B. Temperatur-/Anzeige-Module) sowie M-JET DIAGNOSTIC für umfassende Diagnose, Service-Resets und Service-Funktionen inkl. Schlüssel-Anlernprozessen.

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