[Shane@DBPerformance]

Just get a wideband to know the a/fs and datalogger to see if it's knocking. You could be very rich at part throttle and lean during boost and never know by looking at old plugs.

To truly read plugs, you need to put in a brand new set, do a full throttle run and then shut the car off as soon as possible before letting the rpms come back down and then look at the plugs with a light and possibly a magnifier.