Originally Posted by JHM2K
I leave mine in place, but only because I'm once of those evil kids that likes to hit 135 every now and then.
I'm certain it serves a purpose at that speed. FWIW, Steve (32krazy) left his off and went for a speed run of 140+... he felt (and heard) a huge difference in wind.
So, mine stays on.
I was thinking the same thing John (even though my car never see's THOSE speeds).
I believe it does make the car more aerodynamic.