In my car with this chip AFR increase from 11.5-11.7(when was 60mm tube + 4wd manifold) to 12.4-12.3(2wd + 80mm) at full boost - so it depends from spec of car. closed loop is working: 14.6-14.8 at idle. But when start cold engine AFR is too low imo - 10.0-10.5(engine temp = 5...10C); at my previouse uknown chip st1 afr at this case was above - about 11.5.