I cancelled my XM service today and I have been using my Zune with its FM transmitter as entertainment in my car. The trouble is, the FM transmitter is absolute garbage.

Second problem: tape player in my car is no good, so I can't use a tape adapter.

Is there any way I can hardwire an AUX input into my receiver? I really don't want to have to replace the head unit - I like the all stock look.