as for me i also had to lower the sensor pressure from 6in 6out to 4in 4out and for some reason my engine felt stronger and smoother. that's another thing...now that we have 8:6:1 pistons, does this means the configrations that we previously had on the sensor change? everyone who has their AFC have theirs set at either 6in 6out or 7in 7out. and i'm a little confused when adjusting the Hi and Lo throttle setting. i'm not sure if i have mine set correctly. what does this do to the air/fuel mixture?