This 4-inch 90-degree exhaust elbow is designed for smooth exhaust flow and easy installation in custom or replacement exhaust systems. Featuring a 4-inch inside diameter (ID) on one end and a 4-inch outside diameter (OD) on the other, it allows for a simple slip-fit connection without the need for reducers or adapters. Built from heavy-duty aluminized steel, this elbow offers excellent corrosion resistance and durability under high-temperature conditions. The mandrel-bent design ensures unrestricted flow, reducing backpressure and improving exhaust efficiency. Ideal for diesel trucks, custom exhaust fabrication, and performance applications, this elbow provides a reliable, professional-grade solution for building or modifying 4-inch exhaust systems.