FS ARM Catted downpipes

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I have a used set of first generation ARM Catted downpipes off my 16' F80 M3 comes with o2 extenders. I did not get a cel using the extenders with the downpipes I cant guarantee you wont. without them I got a cel right at 100 miles. pipes have close to 13k on them . These on some F80's required a spacer on the belly pan for fitment mine did (during removal lost the spacer contact ARM sure they will ship it for free they did for me) others have installed without needing it not sure if my installer didn't align them properly . $250 shipped U.S only via Fedex