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in current Austin weather... now this is without the foam AND airguide, vs with the airguide. There may not be any difference if you still have the stock foam piece in front of the radiator (but even on my 95, that piece has rotted, but the fact Nissan put some foam there should mean something). This was also not conducted scientifically, so I can't promise you'll see a difference. I would like to retake measurements, but my techtom is in a million pieces right now :( As I mentioned, the "real" purpose is for show, more than for performance. In theory, there should be a slight improvement in efficiency for the puller fan, in effect, a small extension of the fan shroud, so it should have an effect at speed as well as at idle.
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