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Apex Paul · 03-26-2010, 06:34 PM

If I am not mistaken, the L99 also has active fuel management (AFM) and only comes in the 1SS or 2SS with an automatic transmission. LS3 cars do not have the AFM.

AFM is the system that shuts off half of the cylinders for fuel economy.

03-26-2010, 06:34 PM	#11
Apex Paul Drives: Wagon Queen Family Truckster Join Date: Oct 2009 Location: Louisville, Ky Posts: 1,476	If I am not mistaken, the L99 also has active fuel management (AFM) and only comes in the 1SS or 2SS with an automatic transmission. LS3 cars do not have the AFM. AFM is the system that shuts off half of the cylinders for fuel economy.