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Old 08-09-2010, 01:59 PM   #2 (permalink)
AeroModder
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Location: Oregon
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Tank - '96 Ford Aspire 4 door
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For a roof extension to be of any help in reducing drag, it would need to be sloping downwards to help reduce the size of the wake. Since the OEM one acts as a parachute and forces air over the rear glass (for the purposes of keeping it clean), it won't help FE. The "Fab" style looks more cosmetic than functional.
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