I dont wish to be a smart arse or anything, but from first hand experience pettet does read ns.com and sau forums. They found out all my mods from ns.com, where i had a for sale post. Everything i posted about my car they knew, so I'd say by know he knows you have a chipped ecu, which he'll tell epa, and they'll look for it. May sound far fetched but trust me it's not.