with e46s. I called them up to see if they had any idea why my head unit isn't recognizing the alpine mp3 changer and the tech guy said they're against their product (abmw35v4) being used with the new alpine changer and that it may not work with it because of some timing thing. He then blamed the problem on the Alpine 130b adapter cable. So I just came back from Al and Eds autosound and they said he's full of it. Now I'm waiting for another Soundgate adapter to be shipped to see if I just had a bad one. What a nightmare!