I'm a zune fan/owner and what I do is use the old "made for portable CD players" cassette to headphone jack adapter for my '98GT and stock Mach head unit. Found some youtube videos with it connected up in some cars without using the (IMO) crappy car pack. Don't know specifics, but can be done for sure. Zune connects to USB just like ipods. Here's a couple as a sample. Good luck and let us know how you do it - or me at least .