The shop
Built in-house
in Washington.
GT40 Marine designs, builds, and water-tests marine performance parts for Sea-Doo and Yamaha. We make it, we run it, then we sell it — every kit proven before it ships.
2018
Building since
In-house
Designed & assembled
On-water
Every kit tested
Worldwide
Riders in 25+ countries
Fitment before checkout
The goal is simple: help riders choose the right part before they spend money. GT40 Marine product pages are built around model, year, engine family, and the real hardware path so Sea-Doo and Yamaha owners can verify the part before ordering.
Support after the sale
Buyers get practical install and order support from a Washington-based marine parts shop: free shipping over the current store threshold, 30-day returns on eligible unused items, and a 1-year warranty on GT40 Marine branded parts.