Well, I haven't weighed it in a good while, but you have to remember to include your weight when you do that sort of thing... You aren't just moving the car, you're in there too. That being said, I know our combined weight is more than 3000lbs, and using that number it still gives me 122whp. I've never dynoed over 109whp corrected, 112 uncorrected, and that was about 4whp over what I did the same day with the clutch fan, PS/AC belts still on. With a "weight" of 3100lbs, which is more accurate, that calculator says 126whp. It's generous, IMO.