Those numbers sound a bit off to me. Without a stock pull from the same car, there's no way to know how accurate the numbers are, as most people know. The way the car is ran on the dyno can impact it greatly. I've typed up this how-to to help get the most accurate results possible:
http://www.fiestast.net/threads/how-to-dyno-your-fiesta-st-or-focus-st-correctly.2128/
http://www.fiestast.net/threads/how-to-dyno-your-fiesta-st-or-focus-st-correctly.2128/