I have some 4-1 stainless, it's not DC but a knockoff and is real nice. Brand new with 2.5" collector and O2 bung...$160 shipped. Here's pics (cat flange in pic not included but can be for a little extra.)

http://i25.photobucket.com/albums/c7...er/header1.jpg
http://i25.photobucket.com/albums/c7...er/header2.jpg