Re: 997 sport exhaust, bad news.
it means that past 5000 rpm, the engine sound suddenly becomes much more high, race car-like, and interesting. The difference is quite spectacular. But this only works on the carrera S, because of the Helmholtz resonator (a trick in the admission system I think) that is not present on the carrera non S. To listen to the difference, go there :
web page
under the exhaust pic, click on "911 experience"
then on "driven by precision"
skip intro
then click on "test drive"
and enjoy it...