Ever wonder where Porsche have their parts made?
I know this is nothing new, 80% of everything in the world are
made in China and other developing countries, from G-star jeans to 996 headers.
I found this link for contacting the suppliers in many countries.
You can find many Porsche parts in it too.
Now, they didn't say you can go directly to China and order a sport muffler for your 996 or Boxster. May be you can try.
http://www.alibaba.com/showroom/Porsche.html
There are more than 10 pages, just for fun.