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Sea-Doo GTR-X 300 Tuning: Stage 1 to 3 for the 300HP

Jul 13, 2026

The Sea-Doo GTR-X 300 belongs to the 300HP family and thus provides the basis for a staged tuning concept. At M-JET the range goes from a pure software flash all the way to hardware upgrades.

The staged concept: Stage 1 to 3

Tuning for the 300HP models is built in stages. Stage 1 is a pure software flash via the M-JET FLASHER, without additional hardware. From Stage 2 onwards hardware components are added, and Stage 3 is the most extensive documented level with further hardware.

Hardware for more durability and air

The matching hardware components for the 300HP models include the Titanium Retainer for Sea-Doo 300HP and the Blow Off Valve Kit incl. charge air hoses for Sea-Doo 300. For freer air access, the M-JET 4 Inch Intake System helps.

Diagnostics and care

The M-JET DIAGNOSTIC BRP diagnostic tool gives access to the fault memory and vehicle data. For battery care, the M-JET CTEK Charging Adapter is a good option.

Conclusion

The GTR-X 300 can be built up from a pure software flash with the M-JET FLASHER all the way to Stage 3 with hardware such as the Titanium Retainer and Blow Off Valve Kit. Complemented by the intake system, diagnostic tool and CTEK charging adapter, it makes a coherent overall package.

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Sea-Doo GTR-X 300 Tuning: Stage 1 to 3 for the 300HP
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Sea-Doo GTX Limited 300 Tuning: Stage 1 to 3 for the 300HP

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M-JET POWERSPORTS – software tuning for Sea-Doo and diagnostics for Sea-Doo, Can-Am and Yamaha WaveRunner. Everything runs through the diagnostic port and is controlled from your smartphone, no laptop needed and ready in minutes. The M-JET Flasher adds power to all Sea-Doo Spark models as well as the RXT-X, RXP-X, GTR, GTI, Wake, GTX and other Sea-Doo models. The M-JET Modules extend the system, for example with temperature and display functions. M-JET DIAGNOSTIC is the diagnostic tool for Sea-Doo, Can-Am and Yamaha WaveRunner: read and clear fault codes, view live data, run service resets and service functions, including key programming on BRP vehicles.

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