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Put a magnet on the section of pipe where you want to attach the bung. If it sticks it is steel, if does not stick then it is stainless or some other non ferrous metal..
Not sure if the Corvette exhaust is 401 SS which is magnetic. Martensitic stainless steels which include 401 & 410 are magnetic.
Indeed they are, in my experience you can tell the difference by the amount of attraction the magnet exhibits, the 401 and 410 normally have less attraction than regular mild steel, it is a rough and ready test at best.