I want to play MP3's in my car, but I want to keep the factory fitted head unit. I suppose I could fit a CD-changer that plays MP3s from CD-Rs? Will the track name/title etc. be displayed on my car stereo, or does this differ from brand/type of car stereo etc. I have a Vauxhall Omega. The ideal solution I am looking for is a hard-disk unit that can go in the boot. My questions are: 1) Do these exist? 2) If so, how to you transfer the files to the hard disk? I am sure I read somewhere about some system that sits in the boot of your car and as long as the car is parked close enough to the house, then you can transfer files from your home wireless network. Any help will be greatly appreciated, before I trawl the car-entertainment shops.