Did you ever mention what type of car and weigh were working with here? You can make much less HP and run the number if the car is light. My car weighs 3150 with me in it and a half tank of gas....based off the weight and speed at the end of the quarter mile Wallace racing calculators puts me at approximately 330hp at the rear wheels and just under 400 hp at the crank to run 11.90's. put that baby on a diet!