It's a PorpoiseCraft Fallen angel
I have had my 4.55 Polycraft for 10 years, with a 50 two stroke Yammy and now upgraded to a 60 four stroke Yammy and never a porpoise problem.
They have a bit of a reputation Finga but having said that Giffo has never had a problem.
4.1M + 60HP sounds like a perfect test, time will tell I guess.
Splash's 4.1 will not be a Porpoise but a Wahooooooooo with that power !