Knucklehead Shotgun Exhaust Systems For 1936 - 1947 PART #:411BR and heat shields are recommended

and heat shields are recommended on all rear pipes

723M 38"-long Slash Cut muffler set

clean installation

725D-1 1-1/2"-diameter clamp with tail

322 Fits 1958–1966 Big Twins (OEM 54515-58A)

Knucklehead Shotgun Exhaust Systems For 1936 - 1947 PART #:411BR and heat shields are recommended1 3 4" Shotgun Exhaust Systems For 1936 1947 Knuckleheads An outside the frame front pipe, and a shotgun rear pipe that routes over the transmission, bring a modern style and a throaty sound to your 1936 1947 Knucklehead. They all have slider channels except the 34" drag pipes, which can be installed with P clamps. 729D34 34" long Slash Cut drag pipes (use Paughco #725D clamps to install) 729D40 40" long Slash Cut drag pipes (shown below on bike)