the pipes came from a collection of bends and some NAPA tubing. considerations were taken for performance such as almost identical lengths, no bends are smaller than a 4" radius and the pipes immediate after the exhaust port have a 3 1/2" straight throw before they bend. these considerations made the design a little tricky but i definitely approve of the results. the clearances to the engine, oil tank and frame rails are super tight and the ends are dead-nuts level to the ground.