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      11-15-2012, 11:48 PM   #4
Second Lieutenant
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Drives: 2009 135i
Join Date: Sep 2008
Location: Los Angeles, CA

Posts: 243
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Originally Posted by froop View Post
On your model, being an N55, you only have catalytic converters on the downpipes. A lot of the N54 guys buy N55 midpipes to remove our cats as we have cats on both the DPs and MPs.
good point! totally overlooked that you had a N55 135i. N55 midpipes don't have cats
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