cooked it! What did I do wrong?

I run a turbo 4cyl mopar spirit r/t i put meth injection on the day before i left and had very little tuneing time my first pass read 14afr i kept my foot in it and ran a 12.5 i asked around and the widebands can read off if your super rich. Just a lil info to keep in mind that widebands are not alway accurate iam running an aem also.