Link to official release from Jeep here. So, basically it is the Hellcat drivetrain in the Grand Cherokee. The same difference between the Charger/Challenger SRT's and their Hellcat siblings. - 707HP/645lb-ft - 0-60 in 3.5 seconds Front fascia and rear valance are slightly changed from the SRT version and the quad exhaust sets it apart from the regular SRT out back. Can't wait to test drive it! My dealer will have one as soon as they are available.