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When I am going 70mph and stick my hand out the window, it gets pushed back hard. Now if I had a small box to catch the wind, it would push it harder. I am not saying you get a 1lb boost, but it has to flow better with air getting pushed in rather than getting sucked in.


True, but not enough to make any kind of real difference. Also, as I think has already been mentioned, the longer intake path ads a lot of resistance-restriction to the flow.

1991 Mitsubishi Pajero XP TD LWB family hauler.