Do a search on the site for pc2. Bimmer has a recommended map for the 2 bros slip-on that has been working great for me. He is supposed to be installing an 02 sensor on his bike once it gets back on the road (a story in itself) and I'll be interested to see how his seat-of-the-pants map matches with an analytical measurement of combustion efficiency. In any event, I can tell you that the recommended KN map 3 for full race slip-ons appears too rich at certain ranges for this pipe and I actually lost mid-range power. Bimmer's map cured that big time and the driveability at low speeds is vastly improved over stock. I don't know anything about the flow of your new filter. However, presuming that you are using it within the existing air cleaner housing (unmodified) it may be that the flow isn't significantly different and Bimmer's map will work well for you. Generally, so long as you are not changing the air cleaner enclosure or baffling, the flow rates shouldnt' be materially changed regardless of all the hype to the contrary. To be safe though, call K&N for their recommendation on a map.
