sounds to me that if you want to run that pully with 18* you will need some way to cool that air charge down. either tune with stock timming and no meth or start using the meth. im running a 3.3 (comparitivly the same setup) and i need meth to run with no knock. 11.5-11.7 should be your goal for AFR. forget about your O2s as well if you have wide band. Narrow band is a terrible way to tune if you are running a wideband. all the methanol will do is cool the air charge down, just like a top mount intercooler. only thing i would do if you really want to tune without meth is attempt stock timming and see if it knocks.
