Originally Posted by Modshack

Pic below... The base of the windshield is a high pressure area...removing the gasket allows air to be drawn into the engine bay. You won't see a decrease in actual engine temps, but you will in engine BAY temps, which is good. I've measured this on several cars (Audi TT and Corvette)and found about 18 degrees to be the difference. I need to do it on the Z. here's the Audi chart:




Remove these to let some air in! If you really want to ventilate, pull the plastic cover over the strut bar bolts at the firewall