The cable is passed easily between vacuum pocket under the radio and the radio compartment by an original hole, between the plastic (it makes a small chicane, but nothing problematic). It would also have been easily possible to make out the box under the steering wheel (available for behind the panel fuses for example). By cons it seems more difficult to go to the glove box. Once past the cable, I plugged the jack "CD changer" and the ground wire.
At the product itself, it works nickel. A slight drop in volume actually, but nothing serious. My position recognizes CD01 CD09 directories on my SDHC card 8GB. I left on MP3 long names to recognize them, but they are numbered beginning name (01,02,03, etc ...).
In short, I hesitated a lot before buying. Now I'm not disappointed.