Engine upgrades for the SEADOO RXP-X (12-20) & GTR-X (18-19) focus on strengthening and enhancing the core of the Rotax 1500 platform to handle increased boost and sustained high-performance use. This category includes internal components such as pistons, rods, valve train upgrades, and gaskets, along with supporting cooling system improvements that help manage heat under heavy load. As power levels increase, maintaining proper engine integrity becomes critical, and these upgrades ensure the engine can handle higher stress without sacrificing reliability. Riders building for performance often prioritize these components to create a solid foundation before pushing boost levels further. In addition to durability, engine upgrades can also improve efficiency and power delivery. Enhanced cooling systems help regulate operating temperatures, reducing the risk of heat-related performance loss while maintaining consistent output. When paired with intake, exhaust, and ECU upgrades, these components allow the engine to operate more efficiently across the entire RPM range. Improved internal strength also supports more aggressive pump and impeller setups by ensuring the engine can deliver consistent power without hesitation. For riders serious about long-term performance, engine upgrades are essential for building a reliable, high-output setup that performs under demanding conditions.