I had a 1999 Donzi 22ZX, Stepped hull, 454 Mag EFI ( 385) HP, Imco Power Flow exhaust, reprogrammed ECU, air filter, external Hydraulic steering and a 24p Bravo 1 prop, it ran 73-74 on GPS all day, I later added a Procharger and it ran around 82.7 with 3.5 psi of boost, but it was a scary ride, I never got full throttle. It is a drivers boat, like all the Donzi Classic models, it was my favorite boat I have owned, I wish I never sold it.