Id take a guess to say its less aerodynamic without a complimenting belly pan. If you had a belly pan then the air might make some slight under hood pressure that needs to escape. Then I could see that hood being of some benefit. The smoothest hood for my style Mustang is the 01 V6 style hood. It had a single non-functional cowl in the center of the hood.
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2000 Mustang GT
273hp/ 309ft.lbs.
Cd 0.36 Im working on it
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