1999 Dodge Charger R/T Concept Car

Swoopy, sexy, and insanely popular at auto shows, shown as late as 2004, but never put into production. Why not?

With an exterior designed under Tom Gale and an interior designed under Trevor Creed, the beautiful Dodge Charger concept was supposed to be powered by a 4.7 liter V8 fitted to run on compressed natural gas, putting power to the rear wheels. The supercharged CNG V8 was supposed to propel the 3,000-pound Charger from 0 to 60 in a mere 5.3 seconds, which would have bettered the eventual, real 2004 Dodge Charger Hemi. The 1999 Dodge Charger R/T caused a lot of excitement, but according to one insider, it could not have been built on the same line as the Intrepid and Concorde, and crash testing would probably have required changes as well.
Source