On my 02 wr426 it like to kinda jerk when i hold the throttle about 1/2 way in higher gears. It is kinda annoying as it will get me rocking back and forth on the bike when im doin like 50mph. It is jetted to my knowledge, has an autoclutch, and has YZ cams and a DR.D exhaust. Also, if i put more baffles in my muffler will it kill perfomance and will i have to rejet it? This thing is annoying loud, even to me with my helmet on.