No such thing as hi flow cats, they all have to abide by strict standards. A new cat flows the same as a hi flow cat.

 

That's because new cats are high flow cats.

 

Can you please direct me to your source of information on this. Because if that were the case, MagnaFlow would be falsely advertising there performance catalytic converters. A company with their kind of reputation would not do such a thing, or at least I would like to believe this. You could be right, and I would like to know so that I am better informed. Thanks for any information that you can direct me towards.