The BD Diesel Turbo Downpipe Kit, part number 1045240, is designed for heavy-duty diesel applications requiring high-performance exhaust routing. This downpipe features 4-inch aluminized tubing, offering excellent durability and thermal resistance essential for demanding fleet and performance diesel engines. It is specifically engineered for use with S400 turbos that utilize a full Marmon 4.2-inch flange, ensuring a precise fit for optimal exhaust flow and turbo efficiency. The kit includes a turbo V-band clamp and an exhaust band clamp, facilitating secure attachment and ease of installation. Built with quality materials and BD’s reputation for durability, this downpipe helps improve exhaust flow, reduce backpressure, and support higher horsepower and torque outputs. Whether upgrading a fleet vehicle or enhancing a performance build, this component is designed for longevity and reliable operation in severe duty conditions. Proper installation of this downpipe ensures optimal turbo performance and engine responsiveness, making it an essential upgrade for diesel enthusiasts and fleet operators seeking robust exhaust solutions.
Features:
- Heavy-duty 4-inch aluminized tubing for durability and thermal management
- Designed for use with S400 turbos featuring full Marmon 4.2-inch flange
- Includes turbo V-band clamp and exhaust band clamp for secure installation
- Enhances exhaust flow, reduces backpressure, and supports increased horsepower





















