already did it,spooph said:You could prolly get away with just shimming them. Check these out and ask questions, eh?
http://www.newninja.com/modification-q-a/jet-kit-2334/
http://www.newninja.com/modifications/i-just-can%27t-keep-my-grubby-little-hands-off-of-it!!!/msg32357/#msg32357
http://www.newninja.com/modifications/full-yoshimura-carbon-fiber-exhaust-and-dynojet-2193-install-log/
http://www.newninja.com/modification-q-a/is-a-jetkit-absolutely-needed-after-installing-a-slip-on-exhaust/
http://www.newninja.com/modifications/shimming-the-needles/