Adjust AS for best throttle response..NOT high idle (that's only a starting point).
Most opinions have it that an aftermarket pipe (either FmF) gives up nothing lo-end wise to the stock..but the rev (kg30) does have less on the bottom than the kg35 (torque).
Jetting critical. Mac said that already..........
BTW..thanks for putting in the pipe number instead of some burly, gnarly, desert, mountain bs.........;)
Bottom line is what works for you...what you want/like. Leave everybody else's opinion in the dust ;)