'67 GTS w/exhaust tips???

67 Barracuda with the 273 came with tail-pipe resonators, which is similar to what is on that GTS, except they were only chrome on the tip, see pic below.
Those GTS ones look like after market
67 383 Barracuda did not have the resonator and the tips turned down.
I imagine the same would have been true for the Dart.
The shiny full chrome ones may be correct for 68 and up, not sure, but they could also be just an aftermarket interpretation.

resonator.jpg

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