Big Gun EXO R Head Pipe Yamaha Wolverine / R-Spec / EPS Enhance your motorcycle's exhaust efficiency with the EXO R head pipe from Big Gun. It is engineered to streamline exhaust flow, resulting in improved performance and sound. Features: Precision-bent TIG welded 304 stainless steel head pipe Larger diameter than stock head pipe Lighter than stock head pipe Increased horsepower and torque gains Handmade in the USA Note: Only compatible with Big Gun EXO R slip-on mufflers.