Sea-Doo 350 Specs: RXP-X, RXT-X, GTX Limited and Senna Compared
Brochures like to show one model at a time. If you're choosing between two 350s, or planning around a trailer, a garage or a dock, you need the numbers next to each other. The figures below come from BRP's official model year 2027 spec sheets. The originals are metric, the imperial values in parentheses are our conversions and rounded. Below the tables we explain which differences actually matter.
Dimensions, weight and capacity
| Spec | RXP-X 350 | RXP-X Senna 350 | RXT-X 350 | GTX Limited 350 |
|---|---|---|---|---|
| Hull | T3-R (deep V, fiberglass) | T3-R | ST3 | ST3 |
| Length | 332 cm (approx. 130.7 in) | 332 cm (approx. 130.7 in) | 345 cm (approx. 135.8 in) | 345 cm (approx. 135.8 in) |
| Width | 125 cm (approx. 49.2 in) | 125 cm (approx. 49.2 in) | 125 cm (approx. 49.2 in) | 125 cm (approx. 49.2 in) |
| Height | 111 cm (approx. 43.7 in) | 111 cm (approx. 43.7 in) | 115 cm (approx. 45.3 in) | 114 cm (approx. 44.9 in) |
| Dry weight | 362 kg (approx. 798 lb) | 353 kg (approx. 778 lb) | 382 kg (approx. 842 lb) | 385 kg (approx. 849 lb) |
| Load capacity | 182 kg (approx. 401 lb) | 182 kg (approx. 401 lb) | 273 kg (approx. 602 lb) | 273 kg (approx. 602 lb) |
| Fuel tank | 70 l (approx. 18.5 gal) | 70 l (approx. 18.5 gal) | 70 l (approx. 18.5 gal) | 70 l (approx. 18.5 gal) |
| Seating | 1 (2 with accessory passenger seat) | 2 (passenger seat included) | 3 | 3 |
Engine and electronics
No differences here between the four models. All of them run the Rotax 1630 ACE 350: 350 hp, 1,630 cc, three cylinders, supercharger with external intercooler, closed-loop cooling. They take premium fuel, BRP lists 91 octane for the US. Throttle response through iTC with modes, brake, neutral and reverse through the electronic iBR. The Bosch MG1CA920 runs the show. For 2027, Engine Auto-Start is on the equipment list of all four.
Equipment compared
| Model | Seat | Handling and controls | Display and audio | Extras |
|---|---|---|---|---|
| RXP-X 350 | Ergolock R race seat | Launch Control, hydraulic steering damper with 3 settings, X-Sponsons, stainless steel impeller, low-rise race handlebar | Tech Package standard: 10.25 in. touchscreen, BRP Audio Premium, USB | Carbon hood |
| RXP-X Senna 350 | Matching passenger seat, 2 seats | Built on the RXP-X 350 | BRP Platinum Audio, 2 x 80 watts | 1,991 units, Racing Yellow and Amazon Green, Ayrton Senna's signature, numbered plaque, Senna logo and quotes, branded cover |
| RXT-X 350 | Ergolock, two-piece | Launch Control, hydraulic steering damper, X-Sponsons, stainless steel impeller, tilt steering | 10.25 in. touchscreen, BRP Audio Premium | Swim platform with LinQ |
| GTX Limited 350 | Knee pads, seat storage organizer | Hydraulic steering damper, iDF | 10.25 in. touchscreen with depth finder, BRP Audio Premium with 2 x 50 watts | Limited Package with 2 pop-up cleats, cover, USB and exclusive color, direct access front storage |
The table reflects what the spec sheets highlight for each model. For the Senna, that's mostly the edition details, technically it's built on the RXP-X 350. iDF stands for Intelligent Debris-Free: you clear the pump at the push of a button, which saves a lot of hassle when you cruise through weedy water.
What the numbers mean on the water
Load capacity decides two-up or three-up
The biggest difference isn't length, it's load capacity. The two T3-R models carry 182 kg (approx. 401 lb), the ST3 models 273 kg (approx. 602 lb). If you regularly ride with a passenger and gear, you'll almost automatically end up on the RXT-X or the GTX Limited.
Weight and your trailer
There are 32 kg (approx. 71 lb) of dry weight between the lightest and heaviest version: 353 kg (approx. 778 lb) for the Senna, 385 kg (approx. 849 lb) for the GTX Limited. When you size your trailer and tow vehicle, add fuel, accessories and gear on top. A full 18.5 gal tank alone adds a good chunk.
Length and height for the garage and the dock
Between T3-R and ST3 there are 13 cm (approx. 5 in) in length and up to 4 cm (approx. 1.6 in) in height. For most garages that doesn't matter, for a tight slip or a lift it might. Width is the same 125 cm (approx. 49.2 in) on all four.
Seating: one, two or three
The RXP-X 350 is a single-seater from the factory with the Ergolock R race seat, and a passenger seat is available as an accessory. The Senna comes with that second seat included. The RXT-X and GTX Limited are true three-seaters. If you ride solo today but plan to take the family out in a couple of years, this is the line to think about longest.
Fuel tank: not a deciding factor
All four hold 70 l (approx. 18.5 gal). There's nothing to weigh up on tank size, and nothing changed there from 2026 either.
RXP-X and Senna: same shell, different purpose
The RXP-X 350 and RXP-X Senna 350 share hull and dimensions. The Senna is listed lighter at 353 kg (approx. 778 lb) and comes with a passenger seat, while on the RXP-X the second seat is an accessory.
On to the individual models
The numbers are equally well documented for all four models, so in the end your riding decides. If you're not sure which type of rider you are, which Sea-Doo 350 to buy helps. What changed from 2026 is in 2027 Sea-Doo 350: what's new. Tuning, unlock and diagnostics are identical on all four, and the M-JET FLASHER supports every model. What that means for each ski is on the model pages:
Only want to lift the GPS speed limit, with no tune and no ECU unlock? The Speed Limit Remover is compatible with every 325 and 350, plugs in briefly and doesn't have to stay on the ski.
