Coblt ss super

I have a magnaflow catback and want the muffler that the catback comes with. Im going to make a dual exhaust on my car and need that muffler so that they look and sound the same. Or is there anywhere that people know i can buy that muffler and the part number.

I did some researching and i think this is the part number for it. is it not?

MAG-14256