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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.
1) Drag pipes are not recommended for use on the street.
2) These pipes have less ground clearance than original equipment and may scrape on hard right hand turns. Do not use these pipes unless the front end is extended at least 4" longer than stock or serious injury may result.