Quote:
Originally Posted by woosh
Most desirable: N55 due to least number of internally perforated piping
Next desirable: Later-gen N54 had 30-40 more perforations
Last option: Early N54 had perforations everywhere
Neither are bolt on
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How do you find out it is an early or later gen N54 muffler?
The muffler number for a N54 is 18307559995 on the VIN decoder, but I also found a muffler online with part number 18307559996 which is from a 2009 135i.