Answers come straight from GT40’s fitment catalog.
Sea-Doo · Yamaha Performance
YOUR SKI. DIALED IN.
Exact-fit Sea-Doo and Yamaha performance — built and water-tested in-house. Tell us your machine; we'll show only what bolts on.
Find your exact fit
Make
Model
Year
Exact-fit verifiedTested on waterBuilt in Washington
Exact-Fit VerifiedTested on WaterInstall Guides30-Day Returns1-Year Warranty
Stage kits · Sea-Doo 300
PICK YOUR STAGE.
Pick your ski, watch the gain, then choose your stage. Every kit's a clean bolt-on — start at Stage 1 and climb whenever you're ready.
Pick your skiSea-Doo · top speed scales with your platform
Tested top speedSample
68MPH
Sea-Doo 300 · Bone stock
STAGE 1Start Here
+2–4 MPH
Free up airflow. Wake it up.
4" cold-air intake
Intercooler tubing + 50mm BOV
Catch can kit
Install guide + hardware
STAGE 2Full Bolt-On
+5–8 MPH
The complete bolt-on package.
Everything in Stage 1
Rear exhaust kit
Shorty water box
Ribbon delete kit
ECU tune (optional)
STAGE 3Max Effort
+7–10 MPH
Maxed out. Tune-ready.
Everything in Stage 2
Intercooler
Performance ECU tune (optional)
Sample figures shown.Real GPS top-speed numbers come from GT40's own testing — measured on a stock ski, stated test conditions. Your results vary with water, altitude, and load.
Anatomy of a build
DRAG TO SPIN THE BUILD.
Drag to rotate
Best sellers
WHAT RIDERS ARE BUYING
What riders say
Straight from the water.
4.9/5 · 600+ riders
“Bolted the Stage 2 on my RXP 300 in an afternoon. Pulls way harder up top and the note is mean. Exactly what I wanted.”
Tyler M.
Sea-Doo RXP-X 300
Lake Havasu, AZ
“Ordered Friday, ran it the next weekend. Fitment was dead-on — no trimming, no fighting clamps. These guys know the platform.”
Danielle R.
Sea-Doo GTX 300
Tampa, FL
“Emailed about fitment for my 325 and a real person answered with the right parts in an hour. Can't say that about the big sites.”
Marcus T.
Sea-Doo RXP-X 325
San Diego, CA
“Catch can and intake on my GTR 230 — cleaner intake, more responsive, and it just looks right in the bay. Quality is legit.”
Kevin P.
Sea-Doo GTR 230
Lake of the Ozarks, MO
Sample reviews shown. Real verified owner reviews replace these before launch.
Engineered · Built · Water-tested
We make it. We run it. Then we sell it.
Every kit is designed, built, and tested on the water in our Washington shop before it ships. If it doesn't bolt on clean and hold up, it doesn't leave the building.
In-house
Designed & built
On-water
Every kit tested
Exact-fit
Verified per ski
Live order map
DIALED IN WORLDWIDE
LIVE VIEW — SHIPPED WORLDWIDE
DIALED IN WORLDWIDE
Every pin is a real GT40 order — performance parts built and shipped to a rider somewhere. Drag the globe. Watch it light up.
The lineupStage 2 KitCarbon IntakeRear ExhaustThe Full Build
