Interesting, I was under the assumption that the o2 sensor will only lean out after a certain point of highway driving for a certain amount of time for fuel economy, I will have to read up a lot more. There is a stock map on the dynojet page that will probably work great for a stock bike, as it will be closer than most as all the components will be exactly the same. I would give it a try. I was amazed at the difference in the zero map to the two bros. pipe map on the site with my setup. I have the pair mod done, and a few other little things so I would love to get a custom map done, (plus I get it free as I know the guys at dynojet in belgrade montana.) I would love to see what people have and if they could post it.