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I have a 1994 Yamaha Waverunner 3 . Is there much of a power advantage in removing muffler and running a straight pipe for the exhaust? Also, any chance of sucking in water and damaging engine? Thanks
 

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Removing the waterbox at most would be 2-3 hp. The power comes from the first pipe (expansion chamber) so if you want more power replace that but I don't think they make them anymore.
 
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