Big Gun EXO Full System Exhaust Honda Sportrax 450 Trx450R The EXO Series was created to meet the needs of high-powered MX motors. With a hexagon-shaped aluminum muffler and conical stainless steel inlet, it produces a louder but bearable deep sound, increases volume, reduces heat, and optimizes performance without discomfort or noise disturbance. Features: Light weight brushed aluminum muffler Hexagon shaped large diameter housing for more volume Internal sound wave altering technology for a deeper but tolerable exhaust tone Stamped 304 stainless steel coned inlet for more volume TIG welded reinforced muffler bracket(s) 304 stainless steel mid pipe Black powder coated stainless steel end tip Significant horsepower and torque gains Removable screen-type spark arrestor included Handmade in the USA