The Bulgarian aftermarket specialists from Vilner revealed today their upgrade program for the 2011 Jeep Grand Cherokee SRT8, which they call the SRT600. The tuners from Vilner are specialized in upgrading the interior, so the Grand Cherokee SRT8 gets a special treatment. The SRT600 comes with a red and black Alcantara upholstery, combined with black leather, and various red trim parts. The Vilner Grand Cherokee SRT8 also comes with a unique steering wheel, especially designed to offer the best possible grip. The new steering wheel is covered in red Alcantara and black perforated leather. Vilner also gave their SRT600 LED daytime running lights, and new xenon headlights. In comparison to the standard 2012 Jeep Grand Cherokee SRT8, Vilner's SRT600 develops 135 hp more, thanks to a 600 hp power upgrade developed by Hennessey. Vilner did not announce the price for their Grand Cherokee SRT8 upgrades.