The Roadworks 8 Inch Reduced To 5 Exhaust Elbow is a practical and reliable solution for Kenworth trucks with 45 inch boxes and dual catalytic converters. Made of chrome plated steel, this exhaust elbow features an 8 inch diameter reduced to 5 inches, making it suitable for left and right side applications. It is designed to fit most Kenworth W900L trucks and replaces the OEM part number M66-1270. With its durable construction and precise fit, this exhaust elbow ensures optimal performance and longevity.