Hi all New to the site as have just purchased my first Focus TDCi and wanting to upgrade the stereo. I already have an active sub for the boot, but want to use my iPhone with the stereo. I currently use an fm modulator but want better quality. After a bit of research it seems I have a few options - either upgrade the ford stereo buy and aftermarket HU plus some kind of facia or add an aux cable to the back of the unit. I have no real experience of the focus system and hope someone can reccomend the most effective system. I'd also like to improve the bhp with some basic stuff, air filter etc... Any advice would be very much appreciated.