Hi Paul, Have you tried Armour Motor Products in Bournemouth Their catalogue states that they will make pipes to any pattern,
Roger Hulett/

When I bought the 1928 built TT Replica UE 7373 in 1967. It had been stored in the attic of A E Renolds Liverpool depot since being left for repair by a merchant seamen in 1941. In the 39 years since it was built, it had been available for use for 13 years. The 2″ LH pipe was original.
From my memory, Ken Lack used this as a patten to get some made.
When they were made and offerred to bikes, the angle of the rearward section was not horizontal. The flange plate is so narrow in relation to the overall length, that any angular error is much amplified. I remachined up the flanges to give a bolting face at the angle that gave the correct horizontal attitude for the pipe.
As the welding will distort the flange plate, I suggest to make the initial width of the flange plate thicker and to machine it up as last op to achieve both flatness and alignment.

Hi Lewis. Yes the pipes have been made and I had two of the first ones made for a couple of current projects. They are very, very good and fit perfectly. The man who made the jig and financed them should in theory be advertising them in the next Yowl, but I cannot confirm that or the price. If you have a 1928 flying Squirrel with shortstroke engine they will NOT fit!!!! You need the two inch left hand system that consisted of a cast alloy manifold that connects to a smaller diameter pipe and thence to a Howarth silencer with fishtail outlet. You should be able to get a complete system from Tim Sharp, but if he is out of stock I can sell you a used alloy manifold in sound condition to get you started. If you need it give me a ring on phone number listed in front cover of YOWL. regards. Brian