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Home > Products > Exhaust > Knuckleheads > OTF Exhaust Systems
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photo of 40"-long slashcut drag pipes for knucklehead big twins

1¾" Staggered Dual Exhaust Systems
For 1936-1947 Knuckleheads

An outside-the-frame front pipe, and a rear pipe that routes in front of the transmission, guarantee classic style and a throaty sound. The 34"-long drag pipes can be installed with Paughco #725D clamps. All of the other exhaust systems have slider channels. They fit all 1936–1947 Knucklehead engines.

729 34"-long Slash Cut drag pipes  $189.95
729A 34"-long Goose Cut drag pipes  $189.95
729-40 40"-long Slash Cut drag pipes  $234.95
729GM 38"-long Goose Cut muffler set  $397.95
729M 38"-long Slash Cut muffler set  $397.95
729TM 38"-long Tapered muffler set  $397.95
429R Rear heat shield for Paughco #729 series pipe sets (not shown)  $102.95

Special Notes:
1) 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.

Click part number to add to Shopping Cart

California Proposition 65 Warning
WARNING:
Cancer and Reproductive Harm - https://www.p65warnings.ca.gov

photo of alternate styles of mufflers for knucklehead big twins
Also Available In These Styles

on bike photo of 40"-long slashcut drag pipes for knucklehead big twins
 
photo of 40"-long over-the-transmission slashcut drag pipes for knucklehead big twins

1¾" Over-The-Transmission Exhaust Systems For 1936-1947 Knuckleheads

An outside-the-frame front pipe, and a 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 Paughco #725D P-clamps.

729C 34"-long Slash Cut drag pipes  $189.95
729C40 40"-long Slash Cut drag pipes  $234.95
729CGM 38"-long Goose Cut muffler set  $397.95
729CM 38"-long Slash Cut muffler set  $397.95
729CTM 38"-long Tapered muffler set  $397.95
429CR Rear heat shield for Paughco #729C series pipe sets (not shown)  $102.95

Special Notes:
1) 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.

Click part number to add to Shopping Cart

California Proposition 65 Warning
WARNING:
Cancer and Reproductive Harm - https://www.p65warnings.ca.gov

photo of alternate styles of mufflers for knucklehead big twins
Also Available In These Styles
on bike photo of 40"-long over-the-transmission slashcut drag pipes for knucklehead big twins
 
photo of 40"-long slashcut shotgun drag pipes for knucklehead big twins

1¾" 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 Paughco #725D P-clamps.

729D34 34"-long Slash Cut drag pipes  $189.95
729D40 40"-long Slash Cut drag pipes  $234.95
729DGM 38"-long Goose Cut muffler set  $397.95
729DM 38"-long Slash Cut muffler set  $397.95
729DTM 38"-long Tapered muffler set  $397.95
411BR Rear heat shield for Paughco #729D series pipe sets (shown below on bike)  $102.95

Special Notes:
1) 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.

Click part number to add to Shopping Cart

California Proposition 65 Warning
WARNING:
Cancer and Reproductive Harm - https://www.p65warnings.ca.gov

photo of
Also Available In These Styles
on bike photo of 40"-long slashcut shotgun drag pipes for knucklehead big twins
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