Whoa back there just a minute, ladies!
I had to go way back to a post from September 2002 for this info. So, I fitted DG Hardkrome 3" drag pipes, and a hypercharger to a home made sheet steel airbox and had my 2001 Volusia on the dyno to get it all dialled in.
So the stock bike made 42hp, not sure about the torque.
The bottom line, from the men who built the 422hp, 1600cc turbocharged and nitrous injected Hayabusa and dyno'd my Volusia:
"That's offensively loud, isn't it?
We went for a 140 main, then 150, 160, 170, 180, 200 and then we started to drill out the 200. We run 250 mains on the turbo bikes. This thing is insane.
We have the needle on the last notch, with a bunch of washers under it. At full throttle, it's throwing a foot of flame out the back, and the baffles glow orange."
Peak power at the rear wheel is 50bhp, estimated 70bhp at the crank. Max torque is 59.87 ft.lbs at 3420 rpm.
The hypercharger was a ***** to sort out. It needed the float bowl pressurizing as the hypercharger flows so much air that the pressure in carb body rises above atmospheric, and that stalls the fuel flow through the main jet! FWIW, you a need to drill and tap inside the body of the Hypercharger, and fit a hose barb to bleed high pressure air from between the air filter and the butterflies at the front. This air is then taken through a hose to the carb vent (that normally vents fuel vapour from the float bowl). This equalises the pressure either side of the main jet and allows it to flow fuel correctly. Other than that, it's on a 200+ main jet, and runs sweet as.