STOP RIGHT THERE!!! whatever you do, do not weld any part of the exhaust or any part of the headers. Modify the cat to fit with flanges etc. Don't weld the headers and exhaust because you will lose resale value if you ever decide to sell them later on in life.
The jdm itr cat is a good idea with good flow etc but would you rather buy that... or a brand new high flow cat? I would personally buy something like a good condition sard cat or buy a magnaflow cat and modify the cat to fit the system.
Remember not to weld the headers or exhaust for the love of good.
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