I made these several yrs ago and never used them. They are 1 3/4 OD and are baffled. The heat shields are cheap Chinese. They are still in raw steel with a light coat of black lacquer where I smoothed the welds. The mock up frame I used had Mikuni`s and the pipes cleared the carbs and start lever. Mounts for the rear of the pipe will have to be made. Probably good for a scrambler build? $160.00 shipped to lower 48.