title says it all, i have a 2006 rinker 250 ec 6450 lbs dry weight that came factory with a 280hp 5.7 osi-ef volvo penta, xdp DP with 1:95.1 gear set and F-3 blades. the 5.7 did ok with 2 people but once i filled the fuel tank it was kind of sluggish. if i had a few people on board, a few of my...