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Message: <blockquote data-quote="JL8Jeff" data-source="post: 380825" data-attributes="member: 12995"><p>I had an old Boston Whaler Rage 13' jet boat with the Yamaha 650 jetski engine in it.  I added a Pro-tek wake up kit which included an exhaust manifold, higher compression head, carb modifications and ran a 2-1/2" straight pipe.  It sounded a like a pro-stock jetski and got old quick.  I bought a 2-1/2" water injected silencer off Ebay cheap and routed cooling water to it.  I put a valve on it so I could adjust the amount of water and got the perferct combination of sound and power.  It looks like you could add a silencer to your pipe if you wanted to.</p></blockquote><p></p>