If this one makes an improvement, I want to do something more permanent and flush. There is PVC sheeting at Home Depot, and I could remove that grill section and 'wrap' it.
One of the openings is blocked, the other one is opened. Should I try to make them flush with the bumper or just block off the open one?
The other plan I have is to make a underbody cover for a large void near the rear bumper...its like a parachute back there.
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