I know I paid too much for them but I took a punt on the Yoshimura Cans that were on Ebay, they arrived today and are actally in better condition than I expected, plus they have Allen headed bolts rather than rivets holding them together so they look like they will be easy to strip, polish and paint, and the Yoshi plate on the side looks awesome! Not much lighter than standard cans though!!!
So once I have overhauled them I am dumping the 3-1 and going back to twin booms!