Hey Timpo, you wany my opinion, more people should at least try this, there is plenty scope to get a slip on can on the end of the orig pipework, if cut close enought to the back box, I have a spare standard exhaust if anybody wants a piece of the action.

orig pipe is around 48mm, slip on can will be 50.8mm, so put the 2 together with a new clamp and gasket and slip on end can, hey presto, should be ok.