Thanks ! On performance, I had just wondered if duals tended to lean out the V12, as happens with some setups.
I am most happy to drive along in the LZ at 55 - 60 mph. Both the car and myself feel that is plenty fast. If I want to terrorize the road, I have a Ford-powered sports car that will do a pretty scary job, but I'm getting too old for that nonsense too.
There's a somewhat local custom exhaust shop that I would like to see if they could make a second exhaust line work and add turbo mufflers as you have. It may be that Lincoln designed an exhaust with sufficient pressure for the V12, but I certainly suspect that a dual setup would let the engine breathe much easier.
Plus, duals just have the "look" that would compliment the Zephyr so well.