Well today saw the arrival of my exhaust kindly sent by Millsp1, cheers Davie, As you can see its an original rear box, and over the next few days I shall be taking it to bits and relieving it of some of internals including the flap. Once I get it cut open I will take a couple of photos of the original construction and of the redesign. I understand that this has been done by some here, so any tips on what you changed and the outcome in terms of sound would be good ;-)