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Originally Posted by JAAY
bypass pipes = CELs
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It shouldn't because the bypass pipes would be downstream from the 02 sensors on 2000-2004 models. Theoretically, the car wouldn't even be aware they are there.
Blink, I hear you those headers are $2,200
but they seem one of the best since it has a highflow cat integrated into it with all the 02 bungs. Most systems I see for our cars are of the non-cat variety without all the 02 bungs. I'm pretty sure all the non cat headers will probably cause a CEL. Since the stock exhaust manifold looks totally inefficent, might as well let the engine breath and replace the whole thing.