Rod, I am running a 29 Tempest on my ETEC225HO, and on my older 225HO DI I ran a 27 Tempest. Every boat is different, but on mine there was almost 5 mph difference between the 29 tempest and the 28 Raker II. My rig requires a bunch of lift to make her run and the tempest lifted the boat better than the raker II. I loved the holeshot of the Raker II, just not willing to sacrifice the much on top end.