What makes a Demon a Demon

67Dart273 said

I've never been clear on just what the differences are between a Demon and a "Dart Sport"

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the Demon was the dodge variant of the duster, made from 71-72, then in 73 the Demon went to being the dart sport. basically the same car but getting some updates , just like the duster got updtes every year of its production. clear as mud!!???