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GT40 Marine
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
5060708090MPH
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
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
GT40 Stage kit built in-house
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
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Cities reached
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Skis running GT40
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Top destinations
1Glendale Heights, IL22
2Miami, FL21
3Kissimmee, FL13
4Philadelphia, PA11
5Doral, FL10
GT40 HQ live orders
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Not sure what fits?

Tell us your year and model — we'll point you to the exact kit, or build a custom one.

Email the shop