I know that some cars that use active noise cancelling to reduce the engine and rolling noise in the passenger cabin. Some cars even reintroduce engine noise to give the driver some feedback...
My question is: how or where can I find which cars use such systems? This is a technical feature not listed in brochures and too "technical" for the average showroom guy, IMHO.
Following a link given in the comments I found another link with a listing of cars and noise levels. Auto Decibel