I don't know if it works that way with 04+. My car would drop below the 9's in AFR and no matter what I did in the MAF it would still dip really low. I finally set the PE AFR and it hasn't dropped that low. I went and set everything back and the AFR dropped below the 9's again so I set it back the PE AFR (12's) to what I had it when it wasn't so rich and it's holding. I don't know what's different but there are some things that don't work on 04+ cars for some people. Like injector Skew. It didn't do anything, but Industrial Fish says it worked fine in his car. I had to adjust the IFR to get my car to run correctly, and so did Chrism1.
Jeff