Cobra 4.5 2-into-1 Exhaust For Harley Touring After countless miles on the dyno, Cobra came to realization at times bigger is just better. This new 2-into-1 utilizes a hefty 2-1/2 collector, which converts for big horsepower and torque gains, even more so when swapping out your cam for something more aggressive. The exhaust system uses Cobra's PowrFlo 4-1/2 body that is packed with a sound absorbing pillow like fiberglass which creates a deep rumble. Features Classic 2-into-1 exhaust system is at the top of the class Real world performance gains matched by the perfect deep throaty rumble you expect from the Harley-Davidson V-Twin power plant The muffler body was constructed to not discolor The entire system is guaranteed not to turn blue for the life of the product so with a bit of care it will still look like new years later Features dual oxygen sensor bungs Uses 4.5 body from PowrFlo muffler 3 stepped baffle provides expected sound and power 2.5 collector allows for exhaust gasses to mix, creating huge power gains