It'll suck up hot air indeed if the car isn't moving. When it is moving, there is enough air coming in through the opening where the original setup was, so plenty of outside air hitting it. I've always had cars setup like this and have never noticed a difference on dyno's either. Seat of the pants don't lie and I've been modding cars since 1973. Besides, it helps keep the filters dryer during those storms. I still refuse to ever pay way too much money for cold air intakes when they only consist of 1 aluminum pipe and 1 filter. My butt dyno is all the proof I will ever need. Who knows, I may still add another piece to put the filter in front. It depends what mood I may be in at the time. LOL! I dynoed the car before this upgrade, so when I dyno again, I'll see what HP gains I got out of this. I'll try to dyno when the temp is about the same as it was to keep the comparison fair.