[Digitalize]

They also offer so many different models with such an awful website that I just couldn't be bothered to work out which one I'd actually need.

[abeardo83]

Is it just to play music? I went with a Neet Airstream in the 335. You just plug it in to the aux jack and then stream music to the head unit via wifi (apple airplay). Did just the job for me.

I'd have done it on the M3 too, but I've found some cables in the glove box, which i think are part of a Dension unit... Just need to figure out how the hell to use it now.

[Digitalize]

Primarily music but also answer the phone and use Siri. I considered the AirPlay solution but I'm not sure it would pipe my phone calls through the car speakers, or Siri.

[Sensible_]

Dension Blueway. Expensive but very good.