Jeez I dunno guys. The 3.3 Wayne built for me has all the power I need on my 20' Hydrostream open bow Voyager XT. It is ported with intake spacer, big bore throttle bodies, reeds, and tuner. I think that's all he did to it. Dyno sheet said 339hp at 6150. I have about 10 hours on it now and other than being a little cold blooded, it runs like a dream. Thinking a TPS tweak may solve the cold startup issues.

My setup is definitely the limitation right now. I turn a 30" Drag 4 right up to the limiter and am running just south of 95mph in this old school bus. The HPDI is one heavy bastard, and I need to get it off the 6" setback and back onto the transom. Trouble is, then I'm too deep. Next winter will build another short shaft and get the motor up tight, then she should handle properly and let me really wring it out. The motor makes power, there's no question about that. That said, I'd sure like another 500rpm to play with.