I,ve spent hours reading about this subject , both here and that other site(where loading a bike up to resemble a caravan is the norm lol) ,,,, what i seem to have worked out is some say it will effect low and mid range ,others say that the tube is to far away from the motor to make a difference and others say if you have free flowing exhausts the only thing it will change is the sound .... seat of the pants riding it like you stole it thoughts would be appericated