When I first got it I was a bit unsure. It defiantly made a noticeable difference to the noise and when in dynamic and S for gearbox it never shuts up. Cold start sounds amazing ( not as good as a v8 )there is a drone in cabin at 3 thousand revs. If you’re out for proper drive u will love it. But if your just going for a drive then stick it in E let of the gas when coming up to 3k revs and it just goes up the gears so doesn’t make much drone. And on motorway at 70 is fine. And if u hate it just take it off again. Doesn’t cost a fortune I’ve my middle box in garage