Well i've only had the exhaust (and Twintake) for 5 days and i swear the sound is getting sweeter every day!! When i opted for the Powervalve (Sport) and Twintake, i thought 'sh*t, what have i done, i can't get out of this now', as i was beginning to think the din in the cabin would be unbearable, but i'm SOOOOO glad i chose both these mods, in particular the Powervalve!! At cruising, the noise is really not that much more noisey than the stock exhaust, but floor it and it comes alive, but isnt that why we got our GTi's!!? I won't kid you, both mods together and fitted aren't cheap, but i do feel like i have a new car again, and for the money i spent getting these (and the R Tech remap) on Tuesday, plus my car as part-ex, if i were selling, i do not believe for 1 minute that i could buy a car that would give me anywhere near the amount of exhilerating fun i'm having right now!! I feel it would be unfair to tell you what i paid for my 2 mods with BCS, as it might be less, or, indeed, more than what others paid, or will pay, but speaking purely about the Powervalve, and to quote Jez Clarkson when he was promoting the GTi Mk V, 'Get one of these!!'