You can either get Tony to make one (if he is willing - the quality is excellent) or buy one on Ebay (Oettle make them - do a search for 996 sports exhaust)
I have the Oettle version (at around £280+shipping at the time). It is a copy of the pre-facelift model's sports exhaust. It is not the same as the facelift models sports exhaust.
Over stock it is in a different league. Fantastic, and very good value for money.
Compared to the facelift PSE I'd say it was 8/10 of the way there. The 'Copy' doesn't come on song until around 3k (can be a good thing), whearas the PSE starts from the get go.
The 'Copy' has less of a bark when warm than the PSE does..the PSE is basically a bit more of a beast (in a good way)
But at 4 times the price, I'd much rather have the 'Copy'