do they do the same thing? on my 02 426, i richened the jetting for a fmf t4 silencer since it was backfiring went letting off the throttle, now in some tight sections, it doesn't have the snap right off the bottom like it used too. i am caseing the second double on a double double section that used to be no problem. would the accel cover fix this or should i just go in on the fuel screw. when i had the fuel screw at stock postion the pipe would glow red. it's out 2.5 turns now and it runs great except for a situation like i mentioned before.