A couple more things. The 6L spuns my 3.4 kw impellar to 4000RPM. The 440 spins my 3.5kw impellar to just over 4100 rpm. Fuel burn seams to be the same at about 10 gal/hr. Both boats topped out at 40m ...
I have about 10 hours on my 440 now. Sounds good and runs strong.
A few things you will need to consider. The 6L comes with a fuel system and the 440 doesnt. You do not need to run intank fuel pumps ...