and you did it on a dyno w/ wideband O2? Did you do the tuning yourself(bumping the correction factor down a few % and then run again) or just pay to have someone do it? Could you please give me an idea of the skill level(to adjust the S-AFC) and length of time(dyno time) it took to get it dialed in well? I think an S-AFC may be one of my next mods, just trying to get a feel for how hard it will be to tune it. If the guy doing the tuning doesn't have much experience, I don't see much difference in him or I moving the adjustments around......