One of the not-so-secret weapons lurking in the Jeep arsenal gets launched at the 2011 New York Auto Show--the 2012 Jeep Grand Cherokee SRT8, the version with Chrysler's headiest HEMI V-8 tucked under the hood. The last SRT-powered Jeep was an in-your-face engineering exercise, and the new one's even more insistent: displacement is up from 6.1...
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