what hood scoop setup would be best for lowering underhood temps (esp at idle)?

i was thinking cowl induction scoops facing the windshield were good for removing hot air.. but then thinking about it.. wouldnt a forward facing scoop remove air just as well (ie both of them will just have a hole in the hood underneath and all the scoop does is cover the hole) plus the forward facing hood has the added benefit of drawing cool air in while driving...

comments?