I'm surprised that these units are still so expensive. I would love to get one for my 2009 Touareg, but the cost is still prohibitive. My car only had the base Delta radio. I'm not even sure if I can use the 510 anyway as my car doesn't seem to have a separate amplifier (I checked). I did replace the Delta radio with a RNS2 (DVD), works perfectly but I lost steering wheel controls (probably wrong CANBUS version, I wonder if a 510 is more compatible in that regard).