hello team510, what do you have your fmf programmer set at ??? I just installed 6 one inch uni filters on my air box,,,I'm thinking that if I'm bringing in more air than I probably need to change my settings,,,,,,I have gotten a few backfiring when decelerating like Motokid described,,,,,,,I've got t he usual mods,,,similar to you ad motokid,,,,,,,,,,,,,,,,,,,,,,,,,thanks,,,Jason