On my GrandPrix I sealed the headlights with some thick foam tape by removing the light adding the tape then reinstalling the light I only did it one as I wanted fresh air to enter the intake. One bennifit though is that there is no bounce or shake in the light now as there was before.
A side note I also used foam that is placed around window ACs to seal the large gap in the channel the hood sits in.
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 I move at the speed of awesome.
"It's not rocket surgery!" -MetroMPG
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