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The "tunable" mafci is a superior product to the SAFC-II.

SAFC
The SAFC can only adjust the fuel curve in 8-12 increments.

CP-E Mafci Tunable System
The tunable mafci has a 30 point adjustable fuel curve from 0 to max rpm. On the 6, thats about a fuel adjustment every 233-234 rpm.
http://www.cp-e.com/2005.html

ie you can get a much smoother tune with the tuanble mafci, and extract more power, then you could with the safc.
 
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