Quote:
Originally Posted by SfValley335i
Probably because they can keep using the same exhaust from the n54 135i.
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This. Bmw is not going to entirely redesign something if they can help it. This helps the bean counters stay happy :-)
this also means someone could put the N55 exhaust on an N54 car...with no more secondary cats in the i models, it could be a cheap way to upgrade to a more free flowing factory exhaust.