The D&D Billet Cat 2-1 exhaust system is a stepped header system which offers 1 3/4" at the head, to 1 7/8" to 2 1/8" at the collector and 2 1/2" where the muffler connects to the header and features a 4" muffler body. The Billet Cat is equipped with heat shields, bolt kit, brackets and baffle. The Billet Cat is designed and dyno tested at D&D's facilities to increase low end torque as well as horsepower. The included Vortex wrapped baffle works great on 107" up to 124" built motors. Performance increases are about 8-10% with the proper tune on your motorcycle.
The Billet Cat system also includes both 12mm and 18mm oxygen sensor bungs. At idle, the motorcycle is deep, boomy and full of character.
Note: Blueing and discoloration are caused by excessive heat / improper tuning and will not be covered under D&D's warranty.
Notice: D&D Performance exhaust systems are designed for closed course racing applications only. Not for use on pollution controlled vehicles.