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I was thinking of getting a stock downpipe off ebay and hallowing out the cat part. Stock downpipe looks plenty big then i wouldn't really have to worry about warranty void as it will look factory. But then you gotta figure out a way to keep the CEL off, Have you guys tried a spacer on the rear O2 sensor or it doesn't work on the BMW's
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2013 EB2 335i 6MT
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