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      01-05-2013, 01:30 PM   #17
RickySu
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Drives: 08 135i
Join Date: Jan 2013
Location: Ohio

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Quote:
Originally Posted by Tee-Dub View Post
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?
the situation is , all other parts are stock, except the muffler part is removed.