Ensure your semi is Ready for the Road Ahead with an effective method of directing fumes away from passengers, with the OTR 4" Aluminized 90° Exhaust Elbow. Thanks to its angled design, this replacement exhaust elbow is able to pipe smoke away from the motor to enhance efficiency and decrease noise levels. Crafted with de-burred and finished end cuts for user-friendly handling. FleetPride is your First Click in Heavy Duty .