Engines run rich when they are cold to protect the engine. The sap purpose is to warm up the cat quickly to reduce tailpipe emissions.
On a side note, I had the eu2 tune on my 330ci. It ran perfectly fine on a completely stock m54b30. The reason being is because my sap fail.
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Last edited by sunnyjay; 06-07-2012 at 09:37 AM.