As far as I’m aware, the exhaust pipes on Birmingham Scotts are identical to late Shipley. (can you confim Geoff?)
However, be aware that some spurious “after market” pipes had too great a forward sweep which could contact the front mudguard upon compression of the forks. Also, where the two outlet pipes join – the right-hand pipe protruded too far into the left-hand pipe, so “masking” the gas-flow from the left-hand cylinder by some degree.
I’m bringing a couple of genuine exhaust pipes to the autojumble at Abbotsholme.
