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Yes....with the tailgate up a pocket of air forms in there to take up the space and most of the air goes right over this pocket. If you open the tailgate the pocket can't form and you get turbulence down there.
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--==RPM Resto & Custom==--
1989 IROC-Z Media Coverage:
Chevy High Performance - Readers Rides 4/03
GM High Tech Performance - Tech Article 3/06
Chevy Rumble - Tech & Feature Articles November 2006
Auto Restorer Magazine - Feature Article 5/11
SkinAndSteel.com
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