Quote:
Originally Posted by cerealwars
Mild DIY PE-type mod. Since I had the exhaust off anyways, figured I'd knock this out. This is an N54 135i muffler I picked up off ...
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For other's who might want to go this way.
The N55 version has a solid Y-pipe inside, while the N54 one is perforated.
So if you want to make a BMWPE mod easier, get one from an N55.