As far as I know the offical single engine record (Factory 1) is held by a Velocity at 86mph. This was done with the 525 engine. I've read about guys pushing 27's and 29's close to 95 but they say the boat becomes unstable. Also there are some west coast manufactuers that make some very fast machines like Hallet and Cobra and Laveycraft, but I'm not sure most would consider those real offshore machines, but I could be wrong. There are single engine outboards that can top 130 however but I don't personally know of any offshore "unlimited" single engine class. I'm sure the real experts will respond soon.