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I wasn't sure these really worked, but I talked to a few guys at Bugorama who have them installed in their drag bug quarter windows. Most didn't have any idea whether it worked or not! But one guy said he'd bought his car complete from another guy. The builder had been very detailed oriented and had actually measured the pressure/vacuum in the airbox. The owner told me he recalls the NACA ducts created 3-5lbs of pressure in the box!
Jason
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