12. R/T
Those two letters mean the world to any Dodge fan out there. In fact, they represent one of the most desirable options in muscle car history. The R/T stands for Road/Track and they first used it on the 1968 Dodge Charger. But if you ordered R/T, you got a 440 V8 or 426 Hemi engine, a heavy-duty suspension and lots of other mandatory options.
And all that is what transformed your car into a muscle model of the highest order. The R/T option was also available on Challengers starting in 1970. Also, Dodge used it for several concept cars and production models later.