I did a search and seems as though everyone recommends the Carsound Magnaflow Cats on ebay. I went and this is what i found:
http://cgi.ebay.com/ebaymotors...QrdZ1
is the the right one. I just want to make sure before I purchase. I need one bad. I failed inspection because my oem is out now.

 

get under you car and measure the oem one and get the inlet/outlet to match your exhaust.

 

yeah that one was the 2.5". i saw one that is 2" though. i got 2" from the cat back so i figured i can just get it all welded before the cat to accept the 2" converter. i think my dc header is like what 2 or 2-1/4 right.