I think that sometimes numbers are thrown around without regard to exactly what they mean and the responcibility that goes with them. I also think that forcefeed has a valid point. Not a lot of people can handle the big hp. There are some folks that run around town with an 800 rwhp firebreather, but the fact is that not a lot of people can deal with that kind of power. Bro, 850, even something like 550, is almost unimaginable to 98% of the drivers on the road. That's a lot of juice.
I'm not sure that a daily driven Supra with, say 600 rwhp, should have a smaller, qwick spooling turbo. I have a T-78 that hits hard at 4500 rpm, and is approaching 500 rwhp on stock fuel. It's very predictable and passing is a breeze even when the turbo doesn't deliver it's full force. I think that if I had a smaller turbo, it would come on a lot sooner and making it in turn trickier to drive in town. Nothing will make you up in the morning like the full kick of 500 rwhp riding right up some grandma in a minivans rear end. All this is just my opinion, of course and there are some that will disagree.
Eric
T-78