Beneath this surface layer of early 1970s style, though, the 2015 Challenger is as modern as anything designed by Frank Gehry. Starting under the Challenger SXT’s hood, a 3.6-liter V-6 engine generates 305 horsepower at 6,350 rpm and 268 lb.-ft. of torque at 4,800 rpm. While those figures certainly pale in comparison to the V-8 engines offered in most Challengers, they’re right in line with what Chevy and Ford supply in the Camaro and Mustang.