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I have a lawn edging air dam on my Focus...but it hits when entering driveways and would never handle snow...so this fall I'm going with a plywood underpan that will go from the OEM lip to the crossmember slightly back of the engine....held on by ~ 8 screws that I can easily remove.
Might produce some lift...but since I don't typically drive much over 55...probably won't be significant.
My guess is that a gradual slope to the avg undercarriage height will be more effective mpg wise anyway...the air has someplace to go rather than being bluntly shoved to the side?
Best bet would be a shape similar to the front of a boat...but I probably can't manage that.
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