The Freightliner Replacement Y Pipe is a practical and reliable solution for replacing the OEM part number 04-17129-009. Designed to fit seamlessly, this Y pipe is sold individually and offers a cost-effective alternative to keep your Freightliner running smoothly. With its high-quality construction, this replacement part ensures optimal performance and durability. Trust in this dependable Y pipe to maintain the functionality of your vehicle without breaking the bank.