First Off ..The H2 is a Rolling Aero BRICK.! Even if you add a Supercharger and gain more HP which you will you effect other things down the drive line. Tranny ...U Joints Transfer case ...Diff and so on. The H2 is a well designed rig for what it is.
My 09 has 393 HP and hooked to the 6 speed paddel shift it goes like hell. If your towning heavy loads I can see a Supercharger. Ther are new roots style charges out there that will help you tow big loads up hill with out missing a beat as well as smoke all 4 tires...but then you have to handle with care as after the fun starts the tranny clutches start to cry out for help as well as the rest of the drive line.
I would say ...Take the moon-a and dump it into other items that will improve your rigs looks or off road ability or even sweeten up the interiuor.
Forget about gas mileage... it's a Beautifull big fat boy "Like Nothing Else"
With the aero qualities of a BRICK.
But then again..I always say.. It's your rig do what you want with it...enjoy life and your Fat Boy
And I love my Brick just the way she is.
