1984-2017 Harley-Davidson Softail motorcycles
D&D 2 into 1 Boarzilla Exhaust pipe.
2:1 Boarzilla is a stepped header system at the head is 1 7/8" to 2" 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 on stock motors but may very with built motors with the proper tune on the bike.