Don't know about Prosports but we have a 7.5m Scorpion with a 200hp Yamaha HPDI and it seems to be a good combination. Top speed so far with 4 adults on board has been 46 knots (but that burns over a litre of fuel per mile
). We cruise comfortably in light to moderate conditions at 35 knots
. A bit more oomph would be nice though
(says other half!).