2012 Grand Cherokee SRT8 by hennessy – Price,official Pictures,Features,Specifications & Launch Hennessey Unveiled their super charged 800hp Jeep Grand Cherokee SRT8.Hennessey crew took the 2012 Grand Cherokee SRT8′s standard 6.4-liter HEMI V-8 engine and upgraded to 7.0 L twin turbo forced induction system which increases the output from 470 to 805 horsepowers and 823 lb-ft [...]