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I met with Astroman close to almost a year ago now, and he had a true CAI (one that goes to the bottom of the engine bay) and told me he cut the slits off of the back side of the fog light covers, to let in a little more cold air. According to his computer, it dropped the temp in his engine bay about 25*F. I bought a CAI a while ago, and just two days ago cut the slits off the back side of my fog light covers. I will most deffinately say there is some serious engine temp difference. I noticed my radiator fan took MUCH longer to kick on, and only came on after sitting for several minutes. That led me to my next experiment... cutting the bottom of the air inlet for the cabin air. Problem with that, is that there is a metal piece between the air inlet and the actual engine bay. I mostly wanted a way to cool off the upper side of the engine, since that is where heat goes (it rises). Also, being as far back a that air inlet is, it would do wonders to help cool off the header faster, without having to coat it or wrap it and degrade it's life span any. (Yes, wraps and sprays actually do shorten the life span of headers, ask anyone who has done it 2 years ago or longer). Great idea to make your own CAI. It is smart and cheap. And even looks stock from the topside. Sleeper comes to mind.
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