Quote:
Originally Posted by hazeandfizz
Yes they do. They create an area of low pressure in front of the screen, this gives a forward balance shift. They are a great tuning aid. I'm no top driver and I can tell the difference, if you want a little more front end stick on the cab fwd shell.
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For information purposes only: You will always get higher pressure in front of the screen. Depending on the shape, this effect will be more (or less) pronounced. You will also get low pressure over the roof and behind the cab, with the shape determining how pronounced this is in relation to the high pressure area in front of the screen.
HTH.