12Redline,
I have a 09 XB12r, and I was running the hawk with a K&N filter for half a season. There was an immediate difference of sound and power once I did the tps reset and had the stock ecm learn the change. I recently purchased the EBR ECM for the Drummer per EBR's recommendation. I no longer have backfire and the bike just pulls all the way through a lot stronger. So in my experience, the bike runs better than stock with the hawk and K&N. The addition of the EBR ecm just makes it run all that much better. Hope that helps.