The assist spring does help you push the clutch pedal to the floor. It pulled your pedal after you had pushed about 1/4 to 1/2 the way down, and then slammed it to the floor. I think diaphragm clutch requires less force, but I am not sure. I want a pretty stiff clutch here, but after lossing the assist spring, then going to the stage two clutch; I'm afraid that it might be too stiff. I don't see why it would be bad to use the spring, as it doesn't start to really apply force until that 1/4 to 1/2 mark, but I haven't seen a system on a Mustang yet that had the spring in. Does anyone know for sure?
-Shaun