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      08-25-2010, 03:15 AM   #11
Drives: 2011 E90 DCT Silverstone
Join Date: Jun 2008
Location: Beverly Hils, CA

Posts: 783
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Primary Cat Delete in my experience (dyno verified) without appropriate tuning results in lean fuel mixtures (like 14:1). The impact of HFCs on fuel mixtures will be less, but still you should really have a tune designed for a high flow exhaust system.

I guess BMW could argue that removing the HFCs could screw with the tune but the ECU is very powerful and dynamically adapts to most adverse conditions.
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