Thread: Quad catback exhaust (Group Buy Feeler)
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      01-06-2013, 05:19 PM   #35
Stohlen
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Drives: AW 135i
Join Date: Aug 2012
Location: Waterford, Mi

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2008 BMW 135i  [5.66]
What is the minimum piping size we're looking at here? And by that I mean the smallest part of the pipe if it has to neck down for any reason.
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