Cobras award winning slip-ons for Kawasaki Models are loved by man in the industry including real world riders alike. It's due to Cobra being able to offer increased horsepower and torque with a more aggressive exhaust note. These 4" muffler offers proprietary technology to prevent bluing from occurring. As the louvers in the baffle are positioned further back within the muffler, gasses have the chance to cool before leaving the silencer core making the 4" Billet Tip slip-on mufflers virtually blue proof.; Custom look without a custom price or effort Increased performance gains over stock muffler with a bump up in the low- and mid-range 4" muffler body with proprietary technology to prevent bluing Quiet enough to pass stringent sound test Chrome billet tip Manufacturer's limited lifetime warranty