Yeah, the radio install is another story. Had a professional doing the radio installation, only thing i delivered were the speaker enclosures by Snipescastle2. Although they only used the front enclosures and not the back enclosures. They built custom fit enclosures for the subwoofers in the back.
Radio is a Pioneer AVH-X8500BT, amplifier is an Audio System M 75.4 and subwoofers are from Ampire audio.
Sound is great and the best i've ever heared in a C4.