I have the chin spoiler but you can see my tires are open and with the air the tires churn up that kills the aerodynamics and creates a big drag. For the high pressure under the hood I have the seal removed at the back so the pressure can escape at the low pressure area at the base of the windshield. I am changing the contour of the hood to put a cold air box which will get it's air from the base of the windshield and will do something with the engine area to get rid of more pressure.
