Yes, i have experience since 4500 KM; the Sound is perfect for a Turbo - not to loud; the Price is ok; no problems with the exhaust but the sport exhaust of the normal 997 is allittle bit meaty/deeper
I had my Cargraphic TUV Sound installed by the local dealer who just installed a TechArt system on a car the week prior. The comments were that the fit and finish were comperable and the sound as well. The difference was the price the Cargraphic was 50% of the TechArt.