Clutch pedal return spring required on T56?

[ErikLS2]

I'm setting up the clutch pedal for my T56 out of an '05 GTO and I see on the GTO pedal set there is a clutch pedal return spring. I don't think most people use one but since it was there on the GTO it raises a question in my mind.

Anyone have any comments or experiences with having one or not on their car? Thanks!