Talk to Cat suppliers and Cat manufacturers... they will tell you the same thing... as long as your size it right, you will be fine. The bigger cat, the better... not the pipe size... the amount of cat material inside... If it looks like OEM, that great... if it look like a tiny replacement one, not so good... limited life.
The best news of all is that you can get exacting cat for fraction of OEM cats. Cut old cats of and weld in the new one.