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1984-2017 Harley Softail Fat Cat 2:1 Full Exhaust System

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Product Code: 579Z
Availability: In Stock

Available Options

How to install or Remove a Baffle
How to care for Black D&D Exhaust
579Z-31-32 Part Numbers and Instructions and Bolt Kit

Year: 1984-2017
Make: Harley Davidson

1984-2017 Harley Softail Fat Cat

2:1 Fat Cat is a stepped header system at the head is 1 5/8" to 1 3/4" to 1 7/8" at collector and 2 1/2" where the muffler goes to the header.

  • All D&D full systems are equipped with heat shields,exhaust gaskets, bolt kit and baffles.  
  • Each exhaust system is designed and dyno tested in our facilities.
  • Our testing is done with the Harley Tuner's
  • Every pipe is designed to increase low-end torque and horsepower.
  • Performance increases are about 8 to 10 percent with the proper tune on the bike.

  • Louvered baffles are for 80" to Stock103" motors
  • Perforated Wrapped baffles are for Stage 4 103" to 113" motors
  • Note: The inter core of the louvered baffle is 2 1/4"
  • Note: The inter core of the big boar baffle is 2 1/2"
Using Woods cams for best performance use the Perforated Wrapped Baffle

2:1 Low Cat comes with 12mm and 18mm O2 sensor bungs.

Will not fit the 2013-2016 Breakout Softail beacuse of the oil tank.

At idle, the motorbike is deep, boomy and full of character. Not only does the pipe look good, it is a wonderfully sounding experience for the rider.
Dave Rash, Pope of Pipe

Blueing and Discoloration are caused by Improper Tuning and will not be covered under Warranty

D&D Performance Exhaust Systems are designed for close course racing applications only.  Not for use on pollution controlled vehicles.

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