10.4:1 is rather conservative.. if your readings are accurate. At the same time, that is the type of AF you will find under WOT in most factory turbo cars. It gives you a little margin for a bad tank of gas or anything like that... If I was selling a turn key turbo system for these cars, I would probably want to package the tune with a AF around there... these engines have no problem making more power than the stock internals can handle at pretty dang low boost, i dont think a little rich AF is going to hold anyone back from reaching the max recommended power levels for the bottom end.
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