Ram’s Horn style exhaust pipes were first made in the 1940’s, with originals being extremely rare. These UK-made exahust pipes are 1-3/4 inch diameter and fit Triumph pre-unit motorcycles with 1-3/4 inch spigots at the head as found on the 650 models. These pipes run one down each side, and were popular on desert sleds and hare scrambles bikes back in the day.