Used to replace RNS 300 in Passat 3C year 2007 by Sony car radio. Installed directly in the white Fakrastecker in the car (blue Fakrastecker is Antennne GPS) and the blue wire directly into the pin of the ISO-connector from the radio (pin antenna remote / Power at my Radio blue / white cable) plugged gave radio reception without noise. For me it is difficult to assess whether the reception is getting worse or better than the original radio. The adapter works for me anyway.