In past have had two Superbs, one diesel, one petrol. The diesel was one of the “dieselgate” variety. Dead quiet, wouldn’t know you were driving an oil-burner. Also had 4×4, which should be compulsory on powerful vehicle that size. Petrol one was a 2.0L with 230ish bhp (pre Daily Mail). This was outstandingly smooth, quiet and satisfying to use. Only downside was that it was not 4×4 and would scrabble wheels coming out of a turning at anything but dead slow.