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Remapping Exhaust?

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Not sure if this has been answered I searched the forum and posted on Exotics but no luck yet. Anyway I have a 2009 BMW G450X. I want to do an upgrade on the pipe, cut down on the size and weight. It costs a little more than 1000 for the the full system so I was thinking of just a slip on. If I just get a slip on will the sensors adjust to the new pipe or does taking out that catalytic converter throw off the whole system? Thanks for any help

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