Dual Exhaust Systems on 1972 and 1973 Chrysler models with 440 engines Question

The only fuselage Chryslers I own for 1972-3 are Imperials - a 1972 Imperial 4 door and a 1973 Imperial two door model that both have single exhaust systems. I see that Waldrons Exhaust systems offers a dual exhaust system at least for the regular Chrysler models so I am wondering what Chrysler models in these two model years offered the dual exhaust system? I don't believe there was an HP 440 engine available in either of those model years but maybe I am wrong. Hence the...

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