This dude at an exhaust shop that I get all my exhaust work done at for all my vehicles basically told me that there is no such thing as a high flow cat.

In which he meant that not matter what, a Catalytic converter will only flow "x" amount of shit through it because of EPA regulations. You can put a bigger OD Cat on it but apparently it will only flow as much as a brand new stock one will.

Does that make sense?