Anybody Ever Seen an NOS "Formula "S" Exhaust System?? Now With Pics!!

There would be differences on the over the rear end pipe between the Dart and the Valiant/Barracuda. I know for sure that 65 was strait through but I'm not sure for 66. 65 mufflers have the in and outlet centered.

Cosgig, what is the date code on the resonator? All assembly line stuff have the pentastar.