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07. The air moving past the driver and the cockpit is incredibly dirty. You can help clean it back up and guide the air back to the spoiler by building a “bullet” behind the driver seat. But a sheetmetal bullet like this also serves a second purpose. Air that falls into the driver’s compartment is no longer on the deck creating downforce. The bullet can actually help divert that high-pressure air away from the driver’s compartment and back onto the deck.