[elegant]

This video explains a little of how the dual path exhaust note is obtained. However, while the narrator, Patrick Herrman says that dual-path exhaust is standard, he is Europe's C7 drive tester and in all C7's exported there, the NPP system is standard.

Thanks to motortrend.com for accompanying article:

http://wot.motortrend.com/euro-corv...-air-on-nurburgring-414821.html#axzz2hJyLAJ25