Corvette
With two parachutes,looks like he's going for over 175-mph.At those kinds of speeds,you don't want wheel-spin which could cause you to yaw,and you don't want a little micro-burst side gust to push you into the same thing.
The capping-plates on the deck extension and diffuser will both with downforce and to help keep the center-of-pressure behind the C.G.and help to weather-cock the car rather than understeer into a crash.
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