What the Flash include pretty much depends on the Tuner. But in General they adjust the fueling, raise the Rev Limit, take off the speed limiter, adjust the power curve to gain you a few more ponies on top, Mine also adjusted the traction control where you can change the settings while in motion where the OEM settings can only be changed while stopped. I had mine Flashed By Guhl Motors and they did a fine job. Bike runs smooth and no more throttle issues. I believe they also turn off the O2 sensor and the one other part that usually requires block off plates but with the tune you don't need them. Just get it Flashed and put the ECU back in. It's an easy plug and play mod that is worth every penny.