06-14 YAMAHA RAPTOR700: Big Gun Exo Series Dual Complete 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. Complete Dual exhaust.