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Old 01-20-2002, 11:17 AM
  #11
BigGrizzly
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The pneumatic flappers do move, they loose pressure and oscillate. I have high po ones from CMI, never lost one but I don't run much with them closed either except at slower speeds. They are not to be used at higher Rpms for extended periods.

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Old 01-20-2002, 04:32 PM
  #12
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Location: ALTO, MI
My Boat: 2001 Daytona 26, 1992 SCARAB 34, 1989 25 Checkmate Convincer, 1977 Glastron Carlson CVX 18
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Most of my time is spent crusing at 3000 to 3500 rpm. and believe me the exhaust stays closed because I can hear it when the flappers arn't closed all the way. This boat is LOUD.
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