Is it really necessary to modify the crossmember for a dual exhaust?

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Transmission Cross member Conversion for Dual Exhaust
Layson's Restorations has come up with a solution to the Ugly Low Hanging exhaust. The factory cross members for 1963-66 A-body Mopars did
not have a factory cutout on the passenger’s side. This causes any Dual Exhaust Conversions to an A-body to have the Passenger Side Pipe drop
below the cross member in order to get clearance all the way back to the rear valance panel. We have solved this problem by Modifying the Cross-
member to have a factory type cutout on the Passenger side as well. It bolts up the same as your old one and looks factory original. It comes
back to you steamed cleaned and Powder Coated Black.