the knock begins pretty much thru the entire boost range, im gunna check my timing 2morrow, i run 93 octane always, my lifters r pretty quiet, and i cant tune for no knock, ive gone thru such a wide range of fuel curves that the knock is there even when the car is running so rich it breaks up badly, ive also tried tuning it so lean that it just straight pegs 16 on the egt and it still knocks, at that point i wuz about -40% on the afc, we started at -15% and ran it all the way down to -40% and the knocks wouldnt go away, adjusting 1-2% per run, and the knocks held out the entire length of the run