Stage 5 System provides significant horsepower and torque gains Designed specifically for the new RZR Pro XP 304 stainless steel pipes with dual aluminum mufflers 6061 Billet Muffler Clamps and 6061 Billet Machined Exhaust Tips Includes oxygen sensor bung and USFS approved spark arrestors Fully Tig Welded Made in the U.S.A.. MUFFLER RZR PRO XP ALUM