Cobranip, I had it on the dyno a month or so ago to check my tune with my new turbos. At 13.6 lbs boost it made 563 rwhp on a Mustang Dyno. I drive it on the street (and that one pass at the track) at 15 lbs boost, which I would guess is about 590 rwhp. Here is a vid of the dyno run
http://www.youtube.com/watch?v=w_UCN...eature=channel.
The car weighs 2675 with me in it, full tank of gas, tool box, etc. That's how I raced it as well.
Tires are MT ET Street radials 275/40/17. I have 5000 street miles on them so far and really like them. Over 20,000 miles on my car now, I drive it on the street and winding country roads whenever weather allows.