What's been upgraded in this exhaust system?
 

Recently got a pre-owned C4S and I am trying to figure out what the previous owner changed in the exhaust system, because it's definitely not 100% stock. Don't know owner...got this off a dealership he traded it in to.

Listen here:

http://www.youtube.com/watch?v=k8YNOxkXp2g

Sorry I couldn't rev her harder/higher, she was still cold :rolleyes:

I do not have the PSE option. No button on center console, and I checked the official options list via dealership emailing me the factory options. Nothing noted for the exhaust.

I have no issues with it and I like it, just trying to figure out what's up. The tips surely look stock, but I don't know how to tell if the headers/catback are. Sure I can take to a dealer and have them check it out, and I'll probably do that next month some time when I get the chance.

Thanks!

For me this is only a catback sport + perhaps a new muffler tip, The exhaust manifold sound stock