I am going to get a cat pipe made, I can live with a CEL I will just get a data logger to make sure that is the only problem. Also got my new xede harness today

 

Just curious whether there is any difference re: potential flow between the Vishnu cat and the one sold by Ultimate Racing that purportedly yields less difference between cat and no cat (different tune, different dyno, etc, etc).

Is this advertising hype or are the two cats different animals ?