He owns the same bike as I do, so I would hope he is using a PC V and not the III and it makes a world of difference as the V is much more advanced with fine tuning then the III is. And yes they are fuel management but when you are putting exhausts and filters on a bike you want it to run at its full potential and not to rich or too lean which can happen easily on a bike, its not the same as putting an exhaust and air filter on a car.