My Plus Four is 22MY (automatic) and has the standard exhaust. It is not very loud but does tend to drone at times. It also pops and bangs when in Sport/Sport +. I have listened to a car fitted with the sports exhaust and would say that it is quieter than the standard system when in "normal" but then pops and bands a lot more in Sport/Sport +. If I were to spec the car again I would go for the sports exhaust although the £2,000.00 asking price is very steep.
You really need to listen to both before making a decision.
