The original engine on the XB was a modded 260, I think they call it a Bridgeport? This hull is a full composite and it is less than 1k in weight. I think 950lbs. With the modded 260 it was a 110+mph boat. The P/O sold the engine so we picked up the hull rigged for a Merc. I have played with Merc's before so we may go with that. But Hydro Tec has been great for us with the Yammies and a 300+hp 2.6l should be a blast on that boat. The last boat was a Blazer with a 300hp HPDI with Hydro Tec's stage 3 kit. That one ran 91+MPH but it was a heavy pig, loved the engine but was not a fan of the boat. Bullet builds a great boat also! CJ