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Does "getting coded for emissions" mean cover up the fact emissions are not working--kind of like how VW engineers do it?

And what is the right way? Is there a solution that provides satisfactory emissions performance without coding out faults and having to re-engineer all the wiring connections?

I would LOVE to change headers but am, thus far, dissuaded due to emmissions and connection questions. I think Magnaflow offers some sort of alternate cat design for the E46, but I haven't had all...