How to reduce noise from my Seadoo X20 mercury 2stoke engine

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You need to be more specific. Where is this annoying noise coming from? The ski locker? Sympathetic vibration (buzzing)? Exhaust? Radio? Something else?
 
Assuming you mean the normal thrashing sound of a compact high-output engine.

Do you have the large plastic engine cover in place? That helps some.

Foam and dynamat. Build a separate soft foam lined box over and around the engine. Same around the exhaust system.

Overall, it is not easy. Just be glad it's not a diesel.
 
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