I have yet to put in a k&n air filter,i want to, but have not done so yet.... I just came back from the dealership and i'm dropping off the bike tomorrow for its 8000 mile service and to have it diagnosed. I explained to them the issues I was having so hopefully they can figure it out.do you have a K&N or high flow filter? I had one and it was a manufactured flaw that restricted airflow and made my bike feel like it was dying 85+mph especially when throttle given....now throw a plain filter in...my bike was fine. food for thought.