I could rave about the 100's of things I love about my 2013 Viper, but I still can't get over how good the factory 18 speaker stereo is, especially when connected to your ipod/iphone. SRT and Harmon Kardon really knocked it out of the park with the stereo. The clarity and bass is something you would NEVER expect from a Viper, to the point that even other Viper owners will ask if I have an aftermarket setup. If you are a dealer, you should make sure you check mark that option when ordering inventory units, and if you are in the market for a Gen V, you should make sure you buy one with it, or do the Mopar upgrade yourself.
Mopar Upgrade Kit (Part Number 82213535): http://www.machaikonlineparts.com/oe-mopar/82213535
Installation Instructions: http://www.moparonlineparts.com/docs/82213535.pdf