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Have any of you guys actually looked at the front of your Camaro? Ever notice the size of the upper and lower openings? There huge! So opening up the mail slot wont make much difference. Especially at highway speeds. The only way you will see a difference is if you put it in the wind tunnel. If you open it up it will reduce front down force. Not enough for high way driving. It will let more air in so it would probably slightly reduce under hood temps.
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