Best Sea-Doo Performance Upgrades for 2026

Best Sea-Doo Performance Upgrades for 2026

If you own a Sea-Doo RXP-X, RXT-X, or GTX and you want more speed, better throttle response, and consistent power delivery — this is the guide. We build performance parts for Sea-Doo watercraft every day at GT40Marine, and these are the upgrades that make the biggest difference, ranked by impact.

1. Cold Air Intake — The First Upgrade Everyone Should Do

The stock airbox on Sea-Doo 4-TEC engines is restrictive. A cold air intake opens up airflow, pulls cooler air into the engine, and gives you a noticeable improvement in throttle response and acceleration. It's the easiest bolt-on upgrade and the foundation for everything else.

GT40Marine's 4-inch carbon fiber cold air intake fits all Sea-Doo RXP-X, RXT-X, GTX, and GTR models from 185 to 325 HP. No cutting, no fabrication — direct bolt-on with included hardware. Most installs take under 30 minutes.

2. Intercooler Upgrade (SuperCooler) — Kill the Heat Soak

Heat soak is the enemy of supercharged Sea-Doo engines. After a few hard pulls, intake air temps climb and the ECU pulls timing to protect the engine. You feel it as a loss of power — the ski feels sluggish even though you're at full throttle.

The GT40 SuperCooler replaces the factory intercooler with a unit designed for significantly lower intake temps. The result: consistent power delivery, no fade on long runs, and stronger acceleration from a dead stop. Fits Sea-Doo 230, 300, and 325 HP models.

3. Intercooler Tubing + Blow-Off Valve — Protect Your Boost

Stock intercooler tubing is a weak point on high-boost Sea-Doo setups. Silicone charge pipes with a proper blow-off valve (BOV) eliminate boost surge, protect the supercharger from backpressure, and maintain consistent boost delivery. The 50mm BOV kit from GT40Marine is sized specifically for Sea-Doo RXP-X 325 applications.

4. Rear Exhaust — Free Up the Back End

The stock exhaust system on Sea-Doo PWCs is designed for noise compliance, not performance. A rear exhaust upgrade reduces backpressure, improves exhaust gas flow, and gives you measurable power gains — plus a deeper, more aggressive exhaust note. The GT40Marine Shorty Water Box is a popular choice for 325 owners who want maximum exhaust flow without excessive noise.

5. Catch Can — Keep Your Intake Clean

Oil blow-by is a real problem on supercharged Sea-Doo engines, especially under hard use. A catch can traps oil vapor before it enters the intake system, keeping your intercooler and intake tract clean. It's a cheap insurance policy that protects your expensive performance parts and maintains airflow efficiency.

6. Stage Kits — Bundle and Save

If you're planning to do multiple upgrades, a stage kit bundles the components you need at a lower price than buying individually. GT40Marine offers three tiers:

Stage 1 ($1,039): Cold air intake + catch can + intercooler tubing with BOV. The bolt-on starter pack.

Stage 2 ($1,600-$1,750): Everything in Stage 1 plus rear exhaust and SuperCooler. The sweet spot for most riders.

Stage 3+ ($2,500): Full build including 17.5 PSI supercharger wheel, high-flow injectors, and ribbon delete. For riders who want maximum power. Requires ECU tune.

How to Choose: Start with Stage 1 or Go Straight to Stage 2?

If you're on a budget or want to test the waters, Stage 1 gives you real gains with minimal investment. If you already know you want serious performance and plan to keep the ski long-term, Stage 2 is the better value — you avoid paying for overlapping parts later.

Stage 3+ is for dedicated performance riders who want everything the platform can deliver. It requires an ECU tune (available through GT40Marine) and is designed for riders who are comfortable with a modified setup.

Why GT40Marine?

We're rider-owned and Sea-Doo exclusive. Every part is engineered to OEM tolerances, tested on the water, and backed by a 2-year warranty. Our prices run 20-35% below RIVA Racing on comparable parts, with US-based support if you need help with fitment or installation.

Browse the full GT40Marine catalog at gt40marine.com. Free shipping on select orders.