I threw the car on the dyno again last night after my turbo switch. The car had a slow-spooling, old-skool Turbonetics Y2K 88mm on it. I switched it out to a brand new Bullseye 83mm with a billet batmowheel. Also went with a smaller turbine/hotside wheel (83mm). This new turbo spools MUCH faster that the old 88 and makes just as much power. Its really amazing how the technology of these newer turbo wheels is allowing smaller wheels to make power.
So, on 23-24lbs of boost with a full tank of e-85 and about 23 degrees of timing at that boost pressure, the car made just a tad over 800 rwhp on the Mustang dyno. The kicker is that it made 750 ft. lbs. of torque!