It should have a plate welded onto the header. However beware, I know of many people who had the CARB legal DC header, and their car wouldn't pass smog. The smog attendant said he sees it happen with their headers all the time.
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2015 Ford Mustang GT Fastback - Ingot Silver - 6M - Performance Package - Gibson Catback, JLT CAI, FR 47lb injectors, BAMA E85 tune, Eibach Sportline, BMR wheel hop kit, UPR oil separator, Steeda shifter bushing/bracket
Team B.O.B.® - Ballaz on a Budget