I would now have to say definitely yes. You will be removing the baffle which effects the exhaust flow and back pressure. Now with the K&N air filter you will have a good deal more air flowing through the jugs but the same amount of fuel. This would cause a lean condition and if too lean your bike will overheat, pipes will get much hotter, and eventually you will have engine failure if left alone. More air flow requires more fuel to keep the air fuel ratio within reason.