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      07-21-2010, 02:16 PM   #9
Castel
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Drives: Tanzanite Blue '13 E92 M3
Join Date: Jul 2008
Location: Portland, OR

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Yep, Catalytic Converter. If gas change doesn't help then it might be damaged and in need of replacement. This could mean that your fuel/air mixture is too rich and this potentially damages the cats.