This has been a common practice on circle track race cars for at least 50 years. It was done to get the rear spoiler higher in the air for more down force. They would limit the spoiler size but not the trunk lid/quarter panel configuration. People discount racing as a waste of time but there have been lots of aero in their designs.
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02 Saturn L200 5 speed- 265k miles
84 Gmc 6.5 na diesel K30 4x4, TMU
2006 Lincoln Navigator, 215k miles
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