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.