Thread: 1M has high flow cats in downpipe???
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      08-13-2014, 02:43 PM   #21
cbl117
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Drives: 2013 e92 335i
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I've searched and this was the only thread I could find on this question...

If I have a N54 135i, is it worth swapping my downpipes for 1M downpipes to gain performance, not have a CEL and pass emmisions?
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