I want to get a navigation, satelite radio, iPod ready head unit and I narrowed it down to the Kenwood DNX5120: http://www.kenwoodusa.com/Car_Entertainment/Mobile_Video_n_Navigation/Navigation/DNX5120. My question is can I install this with a simple harness in my 04 Cobra? Or will I have to make modifications to the stereo system? I do not know much about stereos but I've been reading around and it sounds like the Mach 460 system is not easy to upgrade, but correct me if I'm wrong. Thanks for any responses.