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      01-23-2006, 07:40 AM   #2
Tierfreund
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Drives: E90 330i
Join Date: Apr 2005
Location: Germany

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Quote:
Originally Posted by iiotoko
I have ~3000 miles on my Oct build e90 (330i S/P), and have noticed that the left exhaust emits considerably more black gook than the right.

Is there a specific reason for this? Is this something that I should be concerned with?

The right exhaust has a flap that opens only at higher load / revs. So when your on partial throttle (most of the time), you´re only using the left exhaust. Also there´s way moore soot buildup on partial throttle because the exhaust gases are flowing slower and there´s a less complete burning taking place in the engine.

So the effect is normal and nothing to worry about.
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