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M2 Technical Topics > N55 Engine / Drivetrain / Exhaust / Bolt-ons / Tuning > Dual exhaust (Stock)- uneven exhaust flow?

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      06-16-2017, 05:16 PM   #1
AGM2
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So, not sure, if I've just never noticed this on other cars I've had with dual pipes, if this is normal to the M2, I do see quite a bit of black soot on the bottom of the passenger side exhaust.I cannot see anything out of the driver side . If anyone has a more technical take on this please post and definitely let me know if I am not correct. I'd love to know more about it.



Last edited by AGM2; 06-21-2017 at 10:27 AM..
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      06-16-2017, 05:38 PM   #2
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mine is dirtier on the passenger side as well. it's normal.
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      06-16-2017, 06:57 PM   #3
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Valve opens on that side = more mess
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      06-16-2017, 08:08 PM   #4
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Valve is on driver's side (LHD).
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      06-16-2017, 08:43 PM   #5
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I believe It depends on your setting when you drive. If you drive mostly comfort mode the passenger side gets dirtier. If you drive sport/sport+ then both sides of the exhaust tips get dirty.
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      06-17-2017, 02:54 AM   #6
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I have a BMS OBDII Canflap module, I drive with both my valves open all of the time. I still have more carbon buildup on one side relative to the other. Maybe the exhaust also has an inherently uneven flow?
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      06-17-2017, 10:41 AM   #7
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Quote:
Originally Posted by AGM2 View Post
So, not sure, if I've just never noticed this on other cars I've had with dual pipes, if this is normal to the M2, I do see quite a bit of black soot on the bottom of the passenger side exhaust.I cannot see anything out of the driver side . If anyone has a more technical take on this please post and definitely let me know if I am not correct. I'd love to know more about it.


Mine is equally dirty on both sides. That's just the M2's way of telling you need to drive in Sport+ and go over 3k rpm more
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      07-14-2017, 09:56 AM   #8
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Gasses will flow along the path of least resistance, just like water. There is obviously less resistance under cruising speeds for the passenger side. As others have noted, when they drive more aggressively, both get dirty, which adds some credence to the theory lol
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