Playing iPod thru car system?

if your head unit has cd changer controls, you can usually use that input. for 200+ audis DICE electronics makes a nice integration piece, that is what I use and it not only sounds better than bluetooth, I have steering wheel control fo the ipod.

May have to get a newer multimedia head unit that has iPod kit. The newer head units have as USB input.

I just went through that myself.My car unit didn't have inputs and I bought a usa-spec device from Crutchfield.com.It is awesome some installation is required ,nothing complicated though.Check usaspec.com to see which model fits your car.
Best of luck
George