Not knowing the exact specs on the turbo, I would say you could get close to 400 HP running high octane fuel or methanol injection.
Probably w/6-8 lbs of boost ,you will be very happy w/the torque it will produce,since it's a stock engine for now. :-)
I'd say about 250- 300 HP should not be too hard to reach (at the wheels)
Keep us informed w/pics, your camera takes nice pics.
I think you can also unbolt the compressor housing & clock it in the correct direction,, or the turbine housing,(hard to tell w/the pics).
You can get one of those Buick GN bell mouthed/velosity stack type inlets & run a 3 or 4" hose to a K&N filter,(located where heat does not get to it)
MBHD
