D&D 637Z-31M Abuelo Cat Black 2 into 1 Exhaust for 2018-Newer Harley M8 Softail Models
The D&D 637Z-31M Abuelo Cat system is designed especially for the Street Bob, Low RIder, Slim, Fat Bob, Deluxe, Sport Glide and Heritage Classic Milwaukee Eights. Does not fit Breakout or Fat Boy. See 641Z-31M for those two models.
The D&D 637Z-31M Abuelo Cat system is designed especially for the M8 motors. The Abuelo Cat Up-swept is a stepped 2 into 1 header system at 1 3/4″ to 1 7/8″ to 2″ where the muffler goes to the header. The M8 Softail Abuelo Cat full system is equipped with heat shields, exhaust gaskets, bolt kit and baffle and has a Megaphone style muffler housing.
It also comes with both 18mm and 12mm O2 bungs so it can be used with an auto tune module such as the Thundermax Auto Tune. This system is also designed to increase low end torque and horsepower.