A 1970-only model was the Dodge Challenger T/A (Trans Am) racing homologation car. In order to race in the Sports Car Club of America's Trans American Sedan Championship Trans Am, Dodge built a street version of its race car (just like Plymouth with its Plymouth 'Cuda AAR) which it called the Dodge Challenger T/A (Trans Am). Although the race cars ran a destroked version of the 340, street versions took the 340 and added a trio of two-barrel carburetors atop an aluminum intake manifold, creating the 340 Six Pack. Dodge rated the 340 Six Pack at 290 bhp (216.3 kW), only 15 bhp (11 kW) more than the original 340 engine (which also had the same rating as the Camaro Z/28 and Ford Boss 302 Mustang). The engine actually made about 320 bhp (238.6 kW). It breathed air through a suitcase-sized air scoop molded into the pinned down, hinged matte-black fiberglass hood. Low-restriction dual exhaust ran to the stock muffler location, then reversed direction to exit in chrome tipped "megaphone" outlets in front of the rear wheels.
The Challenger T/A's scored a few top three finishes, but lack of a development budget and the short-lived Keith Black 303 c. i. engines led to Dodge leaving the series at season's end. The street version suffered from severe understeer in fast corners, largely due to the smaller front tires. Only 2,399 T/As were made. A 1971 model using the 340 engine with a 4-barrel carburetor was planned and appeared in advertising, but was not produced since Dodge had left the race series.
Source: Wikipedia (original)