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My cummins rep promised me equal if not better performance if I switched from 535 M-11's with 1.76:1 gears to 540 QSC's with 2:1 gears. Although on paper it should have been the same if not a little better because of the QSC's lighter weight, in reality it wasn't even close. That's why I wouldn't even consider the B in such a big boat regardless of the HP.
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