03 Cobra Exhaust Question: Aftermarket Catback or Weld in Mufflers?

Is the 03 Catback 2.5"? If so can I just have some Magnaflows welded in place of the mufflers and make just as much power than buying the same size catback with mufflers?

To me I just don't see anything wrong or too power robbing with the stock catback as long as I get a good straight through flowing muffler. I also plan to add a catted x-pipe.

So how much power will I leave on the table if any, by not replacing the whole catback versus welding mufflers in the stock catback?
 
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I had the Magnaflow catted X w/ regular catback and it sounded nice. Not obnoxious during regular cruise and it screamed when really opened up. :nice: I just recently had some Magnapacks welded in place of the regular mufflers. I needed a lil' more aggressive sound and that did it for sure. :D