I have recently heard that the B44 slipper may fit in the BJ4 WE and i was wanting to know if this is true or not. As i have also heard that it can make a hell of a difference aswell. I would like to know as i wouldn't mind trying one out if it will fit in my BJ4 WE. Just to see the difference, e.g. if it easyer to use, or if it is just the same as the other one, performance wise.