Stage 5 System provides significant horsepower and torque gainsDesigned specifically for the new RZR Pro XP304 stainless steel pipes with dual aluminum mufflers6061 Billet Muffler Clamps and 6061 Billet Machined Exhaust TipsIncludes oxygen sensor bung and USFS approved spark arrestorsFully TIG WeldedMade in the U.S.A.