Can't help you on the jetting, but read your spark plugs! They can tell allot, when I did the K&N and pipes, I did not need to rejet cause according to my plugs, I was running a little rich from the factory. After the swap, nice and golden brown like a roasted (not burnt) marshmallow.
Do a search on "spark plug reading" and download some pics. Do some plug chops, if you do need to change jetting, I don't think you'll have to go to far from stock size. And don't over oil the element when you get the new K&N, thats the biggest mistake people make. Spray it till light pink wait awhile (about an hour) and touch up any spots you missed. Wait a little while longer and ride. Watch the plugs, to rich is to rich, to lean is a cooked piston!!! Kd460