I'll be getting Pacesetter LT headers, which y pipe should I get? I need one with cats because I have visual inspections here, and I have to have cats. I have a Random Tech cat back. Will a Random tech y pipe fit in?

edit: What about TPIS LT headers and a 3" Random Tech dual cat y pipe? Can someone link me so I can find them easily? Can someone help me out with a good all around 3" combo? Thanks!