Well... I guess you obviously want someone to post, so I guess I'd say it is good because you get better flow, but it is illegal. I would say either do it yourself, or good luck finding a shop to do it (illegal to even change the cat before 5 yrs or 50,000 miles unless it is defective). Maybe my post will bump it so someone who actually knows something will post

. BTW, I ordered a high flow cat, but I haven't gotten it yet, so I can't tell you whether it is any better. I have heard getting rid of the cat is good, but I don't have any experience w/ it.
DogP