That article is misleading. The Rapid Transit System was a part of Chrysler's advertising campaign to sell 1970 model high performance cars, including the Roadrunner, The Cuda, the R/T, etc.. I bought two of them in 1970 (A '70 Roadrunner I special ordered), and later that year after I got married and my wife couldn't drive the 4speed, I sold it to a buddy and bought a '70 Challenger RT/SE with auto (and practically every option available).. The Chrysler RTS ads were good, some having the production cars pictured, and some with 'cartoonish' enhancements but with all the RTS cars lined up. I have some of those original 1970 magazine ads somewhere in my mags.
BUT this article and those 'modified' cars presented are not only UGLY as heck, but I don't recall seeing ANY chrysler ads with them depicted. Those are enough to discourage a prospective buyer!