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      04-26-2013, 10:26 AM   #1
Steph
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Belgium
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Drives: M3 Telesto CP MY18
Join Date: Apr 2008
Location: Belgium

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Akrapovic slip-on valve open vs. closed / N54 vs. N55 mid

I have an Akrapovic slip-on on my 1M but no remote control valve kit.
For those who have; are your outer tailpipes completely inactive, i.e. zero exhaust flow, when valve is closed?

In my case the installer told me that they partly opened blocking plate, and indeed the outer pipes do have exhaust gas flow, although not as much as inner pipes. I wonder if it's worth to buy the wireless kit in this case, now it's likely louder then valve fully closed but not as loud with valve fully open...?


Secondly, how does Akra slip-on wih N54 midpipe compare to Akra + N55? Anybody has any sound clips of both?


Thanks