Stay away. Real world dyno in the following thread:
http://www.moddedmustangs.com/forums/99-04/255526-we-need-guinea-pig-2.html
We were originally 284hp and 302 tq with the pi, and streetburner, at BEST, after a cooldown was 287hp and 279 tq. The 287 didnt occur until about 5k. Below that...