I decided to upgrade my stereo in my vehicle and bought everything but the amp kit online. I went to Kartunz and the final price was perfect for installing front and back speakers, new head unit, Sirius adapter with antenna, 5 channel amp, and subwoofer. It took all day and my vehicle was returned to me with all new sound system before the end of the day. When asked about where I wanted the Sirius antenna I mentioned the rear center of the vehicle when I got my vehicle back they placed the antenna on the front left side just above the windshield corner. I felt that was a lazy job. No explanation was given for it. Also no explanation on do's and doesn't for the new system. Since everything is new I would think a simple brief on it would have helped me out. I am not sure of the reason but the SP input was used instead of the RCA inputs on the amp. I am still trying to figure out which is better for sound. For the most part I am happy with the installation and price. I would go back again but with expectations on installation. read more