Watch this 650-hp Hennessey Jeep Grand Cherokee go from 0-60 in 3.9 seconds
There's more than just a Roots-type supercharger bolt-on, with ported cylinder heads and high-flow headers among the many changes made to the engine. You can watch this pre-2014 facelift silver model prove its spec sheet on the drag strip in the video below.
Jeep Grand Cherokee Information
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