just watched a few dale walker pt 1 dyno run, stock gsx 1000f,,,from idle up to 4000 rpm ..A/F was as high as 17.1...after 4000 a/f is not bad.......videos go from part 1 to 6 shows dyno runs and what was done....thats the snatchy throttle problem.....after airbox mod .tuner slipon..ect 146 hp...stock was 136 to 140.....after 40 or so dyno runs with mods gained 6 hp........once full exhaust added 150 plus....60 dyno runs later....his final tune was on the street,,,because the dyno dont show real world results....his words not mine.....so long story short the booster plugs gives the extra fuel the gsxs needs to smooth it out.........now these.s are my words the power commander from what i seen from one of the best.....you will not run that much better over all , power commander vs booster plug unless your a pro tuner and invest 30 or 40 dyno runs....and still does not reflect how it will run in the street.....,,ordering a booster plug now