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Hennessey Performance’s new engine upgrade package for the Challenger Demon raises the muscle car’s output to 1,200 horsepower. Called the HPE1200, the program makes the Demon’s standard output of 840 horsepower look like a puppy by comparison. Hennessey put its crown jewel Challenger Demon program to the test, and as you’d expect it, “mercy” wasn’t in the muscle car’s vocabulary.
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