Big Gun EXO Brushed Aluminum Series Dual Full System 13-7953 for Polaris RZR XP 1000 / XP 4 1000 (14-15) Light-weight brushed aluminum mufflers with&nbsp;Hexagon shaped large diameter housings for more volume Features Internal sound wave altering technology and&nbsp;Stamped 304 stainless steel coned inlets for more volume TIG welded reinforced muffler brackets with&nbsp;304 stainless steel mid / head pipes and&nbsp;Black powder coated stainless steel end tips. Significant horsepower and torque gains with&nbsp;Removable screen-type spark arrestors included. Handmade in the USA with&nbsp;1 Year Limited Manufacturers Warranty