so i have the hks recirc and even at times i get some backfires while shifting. my goal is to try and remove this as i'd prefer not to have them, lol. anyways after doing some logs i am thinking the maf volt range to decrease is from about 1.5 to 1.8 volts as thats usually the voltage i see during shifts and the good news is thats probably the only time i see that voltage. so i'll be doing some testing of this, and i guess if there are guys that vta and want to try and tune it out for that you could use the same principal. anyone else do this?