I have a 2007 C6 Coupe with the stock exhaust, so I am looking for a used set of the 2008 NPP Dual Mode Mufflers, because I read that they will fit without having to change the H-pipe.

Here are the GM part numbers:
LH - 15879288
RH - 15879289

I have searched the big online auction sight and C-list, but had no luck, so I thought I would check the forums.