Quote:
Originally Posted by Derek8819
Does the 1M mid pipe have a different part number than the regular N54s?
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Yes. At least according to
RealOEM.com While the parts diagrams look the same the part numbers ARE different.
1M mid pipes...
135i N54 mid pipes...
1M mid pipes (w/secondary cats) bmw #18307845669
135i N54 mid pipe (w/secondary cats) bmw #18307559994
And lets not forget that the 1M also has
different main cats than a 135i N54. The 1M's main cats are higher flowing cats than what the 135i came with from the factory.
Dackel