Originally Posted by GenoTex
I would imagine (though I don't "know" for sure) that it also helps in the aerodynamics of the car.
Some say it does, some say it doesn't.
All I know is this: Steve (32krazy) ran his up over 100 without the drip pan. Felt a noticeable increase in turbulence and cowl shake. He reinstalled the pan, and no more turbulence... smooth on past 160.
I always run mine installed, and when I'm on Mexican roads doing over 140, it's smooth as a baby's butt.
So, I leave it in place...