The RXT-X 350 is not a ski for a quick lap outside the marina. It is built for open water, for swells and chop, and for long rides with someone on the back. Those long runs are exactly where you notice the factory GPS limiter. Here is what it means on the RXT-X, how to remove it once, and where tuning fits in.
The RXT-X 350 by the numbers
Starting with model year 2027 the RXT-X runs the Rotax 1630 ACE 350: a 1,630 cc supercharged triple with an external intercooler, closed-loop cooling and 350 hp. It replaces the 325. Engine Auto-Start is new on the feature list, and Solar Orange Metallic Premium is a new color.
- Hull: ST3
- Length, width, height: 345 cm, 125 cm, 115 cm
- Dry weight: 382 kg (about 842 lb)
- Payload: 273 kg (about 602 lb)
- Fuel tank: 70 liters (18.5 gal)
- Seating: 3
On top of that you get the Ergolock two-piece seat, Launch Control, a hydraulic steering damper, a stainless steel impeller, X-Sponsons, tilt steering, BRP Premium Audio, the 10.25 inch touchscreen and the swim platform with LinQ for gear.
Where the limiter shows up on long runs
The ST3 hull is why a lot of riders pick the RXT-X for distance. It is designed for rough water, and with 273 kg of payload you can carry a passenger, gear on the LinQ platform and a full tank at the same time. On a ride like that you spend long stretches holding a steady pace across open water.
That is where the factory cap sets a hard ceiling. The ECU limits top speed based on the GPS signal, no matter how flat the water is and no matter if you are solo or two-up. The cap does not depend on load. It is simply always there.
Remove it once, power stays stock
With the M-JET Speed Limit Remover you remove the limit once. Plug it into the diagnostic connector, switch the limit off in the M-JET SLI app and unplug it again. The first time, the device pairs with your RXT-X's VIN.
If you ride with a passenger, one point matters: the Speed Limit Remover is not a tune. Power and throttle response stay exactly the way BRP calibrated them. Whoever is on the back will not feel a different ski. You know how your RXT-X behaves fully loaded, and that does not change. That is also why no ECU unlock is needed.
No module that can quit mid-ride
A SCOM keeps altering the speed signal, so it has to stay connected the whole time. On a long run through chop that means hours of vibration and pounding on one more part in the hull. If a connector loses contact, the limit is back on the spot, wherever you happen to be.
Then there is salt water. If you ride the coast, you flush with fresh water after every trip and you know how fast connectors corrode. Every extra plug is one more spot where that can happen.
The Speed Limit Remover does not add that part. Once you switch the limit, nothing stays on the ski. The device stays at home or in the truck, not in the storage bin. And if you ever need the limit back, for example before you sell, you turn it on again in the app. You can do that on your ski as often as you like.
If you want more power
If you run fully loaded a lot, sooner or later you start thinking about more pull. That is a separate step: software tuning with the M-JET FLASHER. The RXT-X 350 runs a Bosch MG1CA920 that needs a one-time unlock before the first flash.
- Ship the ECU to our location in Florida or in Germany, then reinstall it and flash through the app.
- Or buy a replacement ECU from M-JET that comes already unlocked. Nothing gets shipped in, and the flasher transfers the data from the old ECU to the new one.
The app shows which setups are available for the RXT-X 350, and you can flash back to stock at any time. For how this worked on the previous model, read RXT-X 325 tuning: setup and unlock. Every option is laid out on our Sea-Doo SCOM alternative page.
FAQ
Does the ski handle differently with a passenger?
No. The Speed Limit Remover does not change power or calibration. The RXT-X rides with a passenger and gear exactly as before, just without the factory cap.
Do I need to bring the device on long rides?
No. Once you have switched the limit, unplug it. The setting stays in the ski, and there is no permanent module.
Does this apply to the GTX Limited 350 too?
Yes, it shares the ST3 hull and the same engine. What matters differently on the luxury tourer is covered in GTX Limited 350: no permanent wiring.
