There’s fast—and then there’s what happens when the Sea-Doo 325 platform gets turned all the way up.
RIVA Racing is leaning hard into the latter with its newly released Stage 3 performance kits for the latest 325-horsepower platforms from Sea-Doo, producing a top speed of 88 mph and roughly 400 horsepower at 9,000 RPM.
That’s not a mild bump. That’s a full personality change.
From 68 to 88 MPH
Out of the box, the current 325-powered machines—like the RXP-X, RXT-X, and GTX Limited—already flirt with the upper edge of factory performance, typically landing around 68 mph (U.S. models). RIVA’s staged approach builds from there:
- Stage 1: 80 mph
- Stage 2: 83–84 mph
- Stage 3: 88 mph
All achieved under controlled test conditions: 75°F air temp, smooth water, neutral trim, and about a third tank of fuel. While real-world conditions will vary, a roughly +20 mph jump puts this firmly in another performance tier.
And notably, it’s all done on 91–93 octane pump fuel—no exotic race gas required.
The Heart of the Package
At the center of the Stage 3 kit is a reworked engine management strategy built around a fully unlocked ECU and the Maptuner Nano system. That combo doesn’t just add power—it hands control back to the rider.
The Nano device connects via Bluetooth to your phone, letting you flash tunes, monitor engine data, and even revert back to stock settings if needed. It’s a modern approach to performance: less laptop-in-the-garage, more app-in-your-pocket.
Fuel delivery gets a serious upgrade too, with Bosch 1100cc injectors feeding the higher-output setup, while airflow is dramatically improved via RIVA’s XX-Charger supercharger options—available either as a modified unit or mail-in impeller upgrade.
Supporting hardware rounds out the package:
- Titanium valve retainers to manage high-RPM stability
- Catch can/breather system to keep intake air clean and efficient
- Solas Concord impeller tuned specifically for the setup
Taken together, it’s less about a single “big mod” and more about a system engineered to work in sync.
Not Just Straight-Line Speed
While the headline number is 88 mph, the supporting gains matter just as much.
Reducing cavitation, improving throttle response, and maintaining boost efficiency all play into how the ski actually feels on the water. A build like this isn’t just about top speed runs—it’s about how quickly it gets there, and how cleanly it delivers power across the range.
That’s especially relevant as the 325 platform continues to blur the line between recreational musclecraft and competition-ready machines.
Two Platforms, Same Philosophy
RIVA is offering the Stage 3 kit across both major 325 platforms:
- RXP-X 325 (2024–2026)
- RXT-X / GTX Limited 325 (2024–2026)
Performance figures are nearly identical between them, with slight variations in mid-stage gains depending on hull and setup. GTX Limited models do require an iDF delete for full compatibility—a reminder that as performance climbs, factory systems sometimes need to step aside.
The Fine Print—and the Reality
At just over $4,000, the Stage 3 kit sits in that familiar performance sweet spot: not entry-level, but far from a full engine build.
That said, this is clearly positioned as a competition-use package. It’s not emissions compliant, and it’s not intended for regulated waterways. Installation may be “bolt-on” in concept, but dialing in a setup like this still benefits from experience—or at least a willingness to learn.
And then there’s the bigger picture:
88 mph on a hull as compact and aggressive as the RXP-X is no small thing. At that level, conditions, rider input, and setup all matter more than ever.
