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Old 06-07-2012, 09:34 AM   #14
Registered User
Join Date: Nov 2011
Location: USA
Posts: 191
My Ride: 01 330i
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.
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