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					Originally Posted by NewArt  So my tentative plan is: Chinese no-cat headers, welding in 200 cell cats into my existing TopSpeed pipes, stock muffler. What I need to know is: preferred choices in these elements, placement of the O2 sensors.Thanks for all this brilliant input, the fog is lifting!
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If you are going for this it's basically exactly the same as a Euro exhaust system. The lambdas are in water you call the test pipe either side of the cat. One has a longer wire than the other.
Look at a picture of a Euro cat. It will have the holes for the lambdas.