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I have a 2006 9.9 4 stroke merc on my grizzly 1448 sc. I changed from a 8.5 pitch prop to a 6.5, rpms went from 4300 to 5300 WOT for 8mph gps. I was happy with that, being that I am now within the 5 to 6 thousand rpm rating for this motor. Now, the 5300 is with my buddy and me plus 2...