Cobra 4 Slip-On Muffler For Harley Dyna Switchback Cobra's slip-on muffler for the Switchback has been nothing but successful for riders. That's easily because Cobra exhaust provides increased horsepower and torque while giving your exhaust a much more aggressive note. The muffler has been given a show chrome finish and equipped with a unique shape and cut end cap. Features: Provides increased horsepower and torque with a deeper, more aggressive exhaust note 4 in. muffler has proprietary technology to prevent bluing Single muffler for 2013-13 FLD with stock 2-1 exhaust system Limited Lifetime Warranty