The PowerFlo 2-into-1 uses a massive 2-1/2" collector, which allows for big horsepower and torque figures, especially when changing out the cam for something a little more aggressive. Dual bungs are now standard on this system, which makes it much easier to tune. The muffler section uses a Powr Flo 4-1/2" shell, packed with a sealed pillow of sound absorbing material which provides a deep rumble. The rear is finished off with a brand new El Diablo style billet tip, which is powder-coated in black and etched with the Cobra logo.