The world leader in exhaust systems for V-twin motorcycles has created superior 4” slip-on mufflers for the Indian Chief Dark Horse, Chief Classic, and Chief Vintage. They utilize Rinehart Racing’s unique sound technology and performance promise along with that classic Rinehart Racing look. Designed to be a pure slip-on with no tuning or modifications necessary. Step up and give your Thunder Stroke 111 engine that distinctive Rinehart Racing sound.