There might be. A boat that size though is going to strain a 90 hp motor. At summer camp when I was waterfront director we had a 90 horse outboard ski boat and with my big butt and low center of gravity, I could lay back on the skis and just about stall that poor thing. If you want more speed, you could get it, but at the cost of a long buildup to top speed and a commensurate loss of torque. If you want speed, get a bigger engine if the boat can handle the weight and power. Check with the manufacturer. Also, your hull design might also limit your speed. Do some research. You may find some good suggestions from other owners of your model boat.