I guess i should have posted the article i am referring on custom tunes. I have a different outlook on custom tunes after this article, and had no idea that maf could handle adjusting minor mods as they claim. They are saying headers, mild cams, x pipe, cai not all at the same time but as individual mods the maf will adjust a/f.

http://www.kennebell.net/techinfo/ge...er_ReTuned.pdf