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.
Randy |
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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