Wheelspin?? WHat's that ? I can do this without even reving the engine if that gives you an idea of it's magnitude.
Mine does have the open diff (which is gone as soon as the LSD's are avail to be purchased seperately), for 04 on and on they have standard LSD (quaife no less) and that raises the price $1000 to $20,995. As far as the powerband goes? It's great, I've never been in a F/I'd SVT so I can't compare to yours, but man top end on my car is just as rediculous as low end. An explosion is the best way to describe it, if you haven't test driven one, I think you should, you just might like it? Best thing about the turbo, is the serious lack of lag as in none, zilch, nada. kicks in and stays in of course, the boost controller helps that bit too.