alright. 50-160 is open looped, but wasn't sure as to how high i could go on the afr's there because i can hit around 12-15 psi around those loads sometimes, and was not sure how much fuel is needed at that boost range so i kept it safe. also tuned it when it was 55-60 degrees outside, and since it gets around 100+ at times in the summer i figured that those afr's were the safest bet. ill bring it up to about 12.6 under 4k and sounds like i should be good around there at those load levels. thanks much for the reply