The Freightliner Replacement Exhaust Pipe is a practical and durable solution for replacing the OEM part number 04-21015. With a 4-inch diameter, this exhaust pipe is designed to fit seamlessly and provide reliable performance. Sold individually, this replacement exhaust pipe offers a cost-effective solution for maintaining your Freightliner's exhaust system. Its straightforward design and compatibility make it a convenient option for ensuring your vehicle's exhaust system operates efficiently. Trust this replacement exhaust pipe to deliver the quality and functionality you need for your Freightliner.