Thanks for your reply. No, I was not going to remove and reweld the tubes, but there was just a small hole for the o2 sensor. I am not sure how it all works or why there is an extended tube for the o2 sensors. Just a trick for EMS?
I also notice the factory Cats have a small extension of the exhaust that goes through the flange and there is a small collar the seals to the exhaust manifold. This is not on the test pipes. Do I need to make or purchase a gasket between them now?
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Get some roosters for eggs and Bulls for milk . Then you will see that gender matters. Especially at milking time.
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