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I think a lot of gains are available to me in the front wheel wells, since my jeep is lifted and I have the air dam and bumper caps removed. Along with the vent I would like to add a sheet metal covering to direct air towards the vent. Right now it kind of goes to the back of the fender and runs into my front doors.
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Needs pictures.
A tool you might find useful is the
differential manometer. It would allow comparing the air pressure on top of and underneath the hood.
AutoSpeed - Undertrays, Spoilers & Bonnet Vents, Part 1