Skip to content
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 · 750+ verified eBay reviews
“Works excellent and sounds amazing! I was a little hesitant to not buy name-brand at first, but upon receiving the intake I was extremely impressed on the build quality. The intake is a one-piece molded unit that fits very well in my 2016 RXP. I have zero complaints and I love hearing the supercharger flutter when you let off the throttle. If you're not concerned about name brand this is the way to go.”
justibaptist-0
2016 RXP · Cold Air Intake
Verified eBay buyer
“Power everywhere — on plane faster, more grunt, sounds meaner than with the stock air box. Great upgrade.”
kingcobra3525
Sea-Doo · Cold Air Intake
Verified eBay buyer
“Great quality, came in awesome condition. Bang for your buck for sure and looks amazing on my ski.”
cargo-257303
Carbon Fiber Cold Air Intake
Verified eBay buyer
“Bought a couple of these for my '22 RXP-X and RXT-X — fit great and the seller was great and shipped them out fast.”
bruce5546
2022 RXP-X / RXT-X
Verified eBay buyer
“Great quality, same as brand names use. Fast shipping.”
keles1979
Sea-Doo Parts
Verified eBay buyer
“A++++++ seller. Great pricing and fair shipping! Would buy again.”
jrracingco
Sea-Doo Parts
Verified eBay buyer
“Item exactly as described, super fast shipping, excellent service. Thank you!”
dieselphipps
Carbon Fiber Cold Air Intake
Verified eBay buyer

Real verified buyer reviews from GT40 Marine’s eBay storefronts (gt40racing_1 · gt40marine · gt40.marine), selling marine performance since 2014.

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
0
Cities reached
0
Skis running GT40
0 states·0 countries
Top destinations
1Glendale Heights, IL22
2Miami, FL21
3Kissimmee, FL13
4Philadelphia, PA11
5Doral, FL10
GT40 HQ live orders
Put your city on the map →
GT40 part
DRAG · SCROLL TO ZOOM
NEW ORDER

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