Recently Ive added a 2-1 Muzzy exhaust and and K&N filter along with a Stage 1 jet kit. I adjusted the mixture screws 2.5 turns out per specs. So the exhaust had the popping sound now which from what i understand isnt a bad thing, just annoying. I them removed the EGR valve and plugged the nec. holes per instructions. Now to the point, the bike runs like crap. For the first day or two it was fine, now it bogs down and has no power at roughly 4 to 7000 rpms or sometimes its random. Any ideas before i put the stuff back on and just deal with the popping.