From the article:
Hauk Designs is responsible for creating one of the craziest (and certainly fastest) Jeep Wranglers we have seen, after installing a 707 horsepower 6.2-litre Dodge Hellcat engine with 650lb ft of torque paired with an automatic five-speed gearbox from Mercedes in five-door Jeep Rubicon model.

Photos - Hellcat-Powered Jeep Wrangler

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Whoa! Had to write this one up for the front page...
Meet the Hauk Hellcat, a 707-Horsepower Wrangler - JK-Forum