DescriptionEVO R Series exhaust system has 27 years of Mike Young's personal racing career built into it Mike has found that having the most horsepower and the lightest exhaust was not always the answer You truly need an exhaust system that will give you the most tractable horsepower and in most cases a slight weight reduction in the exhaust area can be quite helpful also Contains our state of the art computer mapping power curve to get the best broadest power available Race Tools hi-performance silencer pillow packing with a stainless steel wire screen to keep the decibels down and the power up Removable spark arrestor for those that race on USFS lands Billet aluminum outlet end cap with removable tip for spark arrestor This item fits the following models: Honda TRX 400EX / X (99-14)