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the only O2's we have are on the headers before the cat so no prob with that. I have a cutout right after the cat and I had alomost nothing coming out of the pipe, very little pressure.
If u hollow it out and it rus fine then thats your problem. If not u f'ed up an ok cat. You can pick up a carsound/magnaflow high flow for 65 bucks if ur out of ideas though.
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