FD web Utilities and Reference.
  From Rotary performance online

Probably one of the most usefull FD tools on the net.
Works out how much power you can get out of your fuel system, including the addition of extra injectors.
  Check out Derek Vanditmars' most comprehensive site on the subject we all dread to think about!.
He's also got a colour coded vaccumm hose diagram.
Over view picture
  Enter you car's weight and 1/4 mile time and it will guess your HP.
Seems to work OK for street tyres.