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      04-30-2012, 03:24 AM   #142
Drillslinger
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Drives: BSM 1M / R53 / E91
Join Date: Jun 2007
Location: No. VA

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Quote:
Originally Posted by flavush View Post
- Does the change of N55 to N54 midpipe cause any issues for the "Check Control" or should I have any problems for warranty?
Not sure about warranty but there are no sensors in or behind the mid-pipe so there won't be a CEL. A mechanic familiar with the N54 or 1M might notice the lack of secondary cats but I doubt most would notice just by looking underneath.


Quote:
Originally Posted by flavush View Post
- On the videos I can't hear much difference. Does only the N55 midpipe sound much louder than stock N54 midpipe?
In my experience it's not much louder but the tone is deeper. More of a growl. I also noticed more of the "gurgle and pop" when off-throttle that I love. (Sounds more like my MINI off-throttle)

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