Big Gun Evo R Head Pipe Honda Trx250X / Trx250Ex The EVO R Series stainless steel head pipe not only reduces weight but significantly enhances performance and emits a superior sound compared to the standard setup. 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: Images are for reference only. Not compatible with stock muffler.