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when i tried this with my VAFC-2 it seemed like 6 and 4 made a 2pt difference. not sure which way (6 in, 4 out or 4 in, 6 out) went more rich since it was a lot harder to get info on this than i thought. but there is DEF an MAF correction. my guess is people havent gotten it to work because the correction is either too much or too little for them. its not like its hard to tune part throttle and idle with it, i have my car running pretty lean on part throttle and everytime i check it the part throttle readings are right where i want them. i dont doubt its easier with the safc, i just think if you are willing to spend some time getting it right that the vafc would be better cause of the many correction points
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