One easy way to test to see just how restrictive (or non-restrictive) the stock air filters/boxes are would be to just make a dyno run with them on, then take them off. Can't get any more open than that. With the hood up on a dyno and fans blowing on the motor it's gonna get cool air making the CAI test kinda moot as they would be somewhere a bit less than just no boxes at all.
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