The Grand Rock Freightliner Replacement Pipe is a practical and reliable solution for replacing the Freightliner Part # 04-16639-001 in the Classic Model. This replacement pipe is designed to replace the 04-09586-015 and features a 90-degree elbow with a 5" OD. It is available in both Aluminized or Chrome and fits most Classic Freightliner makes and models. With its durable construction and easy installation, this replacement pipe offers a convenient and efficient solution for your Freightliner needs.