Hydro Tec, I have a 3.1 200 OX66 with 1.75 HPDI Lower unit. I have the reeds, tuner, heads, and solid mounts already and i'm curious on what my estimated horsepower is? I would also like to know how much horsepower i will gain if i add the Spacer, Big Bore TB, worked Reed Blocks and Velocity Stack. Thanks and i'm sure i'll be calling you gauys in a week or so to get my fix from the Yamaha drug store![]()