Here's my dilemma:

I ordered a Carsound cat that from Hybrid Garage via an eBay auction that said that it would fit onto the JDM header. I was trying to install all my exhaust parts this past weekend but it turns out that the Carsound cat's flange is not wide enough for the flange on the JDM header :x

A friend of mine said that there's a company out there online that will sell me a test pipe that has an opening for the oxygen sensor bung and that it won't throw any lights, either. He's trying to get in contact with another friend that used to have an ITR with that test pipe. Any ideas on what I'm talking about? How about experiences using test pipes in general?

The other option I have is to cut the tip off on the header side of the Carsound attach a new flange and then reweld the tip. I have misgivings with the Carsound now, though, because the flange just surrounds the tip loosely instead of being welded to the cat itself. I'm worried about the flange on either the header or cat side shearing. Also lacks a screw hole for the cat oxygen sensor =\

Can anybody help?