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i wouldnt do it because im never going to drive around with a headlight out on the street. i always ran my cars (before the stang, havent ran it yet) in street trim for that same reason
Yes, I'd say as much as a tenth in the 1/4 in cool weather. In hot weather the difference between the underhood temps and outside air temps is less so you gain less.
The Mach scoop is in a low pressure area and is restrictive.
The underhood filter can get a good shot of cool air from the fenderwell or removed headlight.