comparative analysis and a lot of computing have determined that headers on a fuel car has 8 or 900 lbs of down force that also can be used as thrust if raked back far enough.

This was a test header they used in experimenting with down force and thrust.

 This header propelled Jacks car to 3.901 sec in 1000 ft @ 325.69 mph for a new national record the quickest run in a funny car.

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