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verbi69,Once again,been a while since I've been here so sorry for not getting back to you. My 548 makes 640 hp @ 5400pulling ALL accessories(p/s'water pump,wet exhaust,circ. pump,alt)it makes 680 ft lbs tq at 3900. It was dyno at Percision Marine in New Orleans. I just bought a 38' Top Gun with 598s so the 280 is still for sale if you know anyone. Bob
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Bob280Silencer
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