I just saw a time attack car that had an air dam that went from the hood to the windshield.

thoughts?

 

Sorry, this is all I could envision.

 

Wiper delete required.

Helps for shaving hundredths.

Plenty of serious TA cars seal off the cowl but it's not an area with a lot of gains. Most of it is so high pressure air doesn't push its way into the engine bay, which the cowl already does.