It was custom made. DMC, Discount Muffler Center, over in La Verne just North West of the Fairplex. Let them know Michael referred you. They cut me a deal since I was referred by FSR (the shop where we have the Dyno Day at). The owner, Higinio, and Chris, who I'm guessing is kinda the 2nd in command, are pretty nice guys.
I got the GT-15 flange and a cone to go up to 2.5" from Whitbread, the 6" flex pipe is one from Vibrant , the cat is a Magnaflow 93006D, and the muffler I had shipped to my place. All of these are on top of the DP & Exhaust that I bought at other points in time.