Thats all true, but the heading of this forum is aerodynamics. You can do a lot with horsepower but it gives you a limiting airspeed. Now, if you clean up the airflow around the airplane you can extract another 5-15% extra speed from it. Two birds can attain the same airspeed even if one uses a smaller engine, all you have to do is clean as much of the fuse profile as you can. If all you care is to go fast for a short distance then strap a rocket engine and let it rip. If not why do non-quickie pylon racers are so streamlined?