Strip down any big-brand luxury vehicle, and you'll find among other things piles of sound-deadening products under that plush carpet. There's a reason why cars verging on bigger sizes and at the higher end of the pricing scale are whisper quiet inside. They have more than a few layers to drone out sounds and vibrations emanating from different areas. Tyre, road and wind noise all need to be silenced. As well as the excessive engine, transmission, and exhaust bangs, pops, and rumbles. These can get to irritating levels in older and cheaper cars that are missing out.