Well it is the 4 pot bangers with pops and bangs which is generally the issue, Not a V12 Aston Martin sounding glorious as it rolls down the road, put if said cameras target said cars would be very unfair, it is OK on some of the more modern ones as the owner can just press exhaust button in said areas though not all cars have exhaust modes, my 600 LT does not but I'd be amazed if that ever set of a noise camera it sounds like a Dyson.
The 458 however can emit very fruity sounds and burbles totally at random, yet its stock.