in response to your it stays shut until blah blah blah the air is pulled by a vacuum in from the intake it enters from the path of least resistance like said. those damn valves are always slightly open thanks to them even being there so there is always a leak of hot air into the system they just don't open all the way until there is a downstream restriction (water or a dirty filter). not to mention that the valve itself causes turbulence in the pipe and hurts performance simply by being there. which is why a lot of people with aem intakes throw that crap out and install a silicone coupler then it's a great intake.
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