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      01-05-2013, 11:09 AM   #14
Tee-Dub
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Drives: 2008 135i
Join Date: May 2009
Location: Vancouver, WA

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I keep reading how restrictive the 135's stock exhaust is though. I wonder if they are referring to the catted mid-pipe on earlier years (mine) or is it the axle back that is so restrictive? For those of you that installed cat-less downpipes but kept the stock section, did you have any issues with the secondary cats getting clogged up?