Quote:
Originally Posted by duder13
Fantastic post, and I think I finally get it with the whole exhaust mod thing. Correct me if I'm wrong, but it looks like my N55 simply needs the three large holes welded shut (and valve defeated) to effectively act like the PE exhaust, whereas N54s also need the two y-pipe perforations welded shut, yeah?
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Yes that's correct, from realoem, the muffler part number for n55 is different and all the photos of N55 exhausts have that Y pipe as a solid piece. You can use a $5 ebay endoscope camera to verify too.
In your case, welding the 3 large holes and leaving the other perforated pipe alone would be a winner. Imo, the valve is a great feature of the PE mod and definitely makes the exhaust a lot more civilised in comparison to the PE, which is quite loud.