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2015 ecoboost mustang, Arizona Okay, so i know this has been talked about many times with no real answer. Has anyone had first hand experience of Flashing their ECU back to stock and not being detected by the dealership? or does anyone have a legit source who can confirm this can not be...

This may be a stupid question but is it safe just to unhook the rubber recirc hose going from the stock BOV back into the CAI so it just vents into the atmosphere? this is obviously just for the blow off sound and i would cap it on the CAI end. Is this safe?