"David McNally" wrote in message
om...
I'll agree with the others it will take a LOT more power to increase
speed 10mph. A buddy of mine wanted his stock 454 powered 24ft Baja to
go faster. Basically he had to double the power to increase top speed
by 12mph.

You have got it. PLUS onthat Baja, it can be trimmed out of the water.
An inboard can't. Its taking me 200+ more HP to gain 12-15 mph on my
Formula.