New to blog. Bought 2014 328 xi last year. Really like the car but could definitely use a backup camera. Car has "navigation system with touch pad package". Questions: 1) Will I need an interface as well as the camera itself? 2) Have seen Naviks Interface & camera on line (Advertised as plug & play.), Anyone had experience with this brand or are there others that are more reliable. (Parts manager at dealer claims he can get nothing & suggested what I"m now doing.) 3) camera-source.com. Very nice people , but no BMW hardware & could not refer my anywhere. Any help will be greatly appreciated. Paul