e-series exhaust

i have a 2000 wr 400 i just installed a e-series ex. with the tappered head pipe, i have air lid off, my ? is i get a slight hesitation when you wip the throttle open do this mean i need jetting, iam running 12 discs in the pipe. other wise the bike is a animal

do the bk mod first

did mine saturday and rode sunday

its like riding a different bike

ok whats the bk mod give a little insight thanks

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