13-14 POLARIS RAN900XP: Big Gun Exo Series Slip-On Exhaust As the Side x Side and ATV markets continue to expand, Big Gun realized the need for something bigger and better. The EXO series is the ground up approach at building an exhaust that could handle the huge demands of the larger, more powerful motors. The unique hexagon shaped muffler and coned inlet allow for significantly more volume, delivering a tolerable deep sound and decreasing heat. The EXO Series is Big Gun's largest, most durable and most powerful exhaust yet.Lightweight brushed aluminum muffler.Hexagon-shaped large diameter housings for more volume.Internal sound wave altering technology.Stamped 304 stainless steel coned inlets fo Big Gun exhausts are NOT LEGAL for sale or use on pollution controlled vehicles in the state of California.