2006 Dodge Challenger RT Concept 6.1 Hemi, 425 Horsepower. Challenger draws upon the initial 1970 model as the icon of the series We wanted the concept car to evoke all those sweet memories … everything you thought the Challenger was, and more. The five-spoke chrome wheels - 20-inch, front; 21-inch, rear — are set flush with the body side, giving the car the powerful muscular stance. The hood reprises the original Challenger performance hood and its twin diagonal scoops, now with functional butterfly-valve intakes. Designed to showcase the modern techniques used in fabricating the car, what look like painted racing stripes are actually the exposed carbon fiber of the hood material. Exterior details one might expect, like a racing-type gas cap, hood tie-down pins, louvered backlight and bold body side striping, didn’t make the “cut,” the designers feeling such assorted bits would detract from the purity of the monochromatic body form. But tucked reassuringly under the rear bumper are the “gotta have” twin-rectangle pipes of the dual exhausts