BD DIESEL 1045240 DOWNPIPE KIT S400 4 INCH ALUMINIZED FULL MARMON 4.2 C/W CLAMPS

Product Description

The BD DIESEL 1045240 Downpipe Kit is a high-flow, heavy-duty downpipe solution designed for S400 turbochargers using a full Marmon 4.2-inch flange. Built from 4-inch mandrel-bent aluminized steel, this downpipe improves exhaust flow, supports higher boost applications, and provides a reliable connection for compound or custom turbo configurations where a full Marmon 4.2" outlet is required.

BD Diesel 1045240 downpipe kit, S400 downpipe 4 inch, full marmon 4.2 downpipe, aluminized downpipe kit, compound turbo downpipe, S400 turbo exhaust downpipe, turbo v-band clamp, exhaust band clamp

Originally designed as a replacement downpipe for BD Diesel compound twin turbo systems, the 1045240 is commonly used in custom performance builds that require a strong, leak-resistant connection between the turbo and the 4-inch exhaust system. This kit includes the required clamps for installation, making it an excellent choice for high-heat, high-load towing and performance applications.

Fitment

• Universal performance application for S400 turbos with full Marmon 4.2" flange
• Designed for use with 4" exhaust systems
• May require modification depending on vehicle/turbo configuration

Key Features & Benefits

• 4" mandrel-bent aluminized steel downpipe for improved exhaust flow
• For use with S400 turbochargers using full Marmon 4.2" flange
• Includes turbo V-band clamp for secure turbo connection
• Includes exhaust band clamp for connection to 4" exhaust
• Proven replacement part for BD Diesel compound turbo systems

What’s Included

• 4" aluminized steel downpipe (full Marmon 4.2")
• Turbo V-band clamp
• Exhaust band clamp

Cross-Reference & Compatible BD Diesel Products (BD DIESEL ONLY)

• BD DIESEL 1453602 V-BAND CLAMP S400 FULL MARMON TURBINE / S300 SX-E (NON-COBRA)

Is this downpipe vehicle-specific?

No. This is commonly used as a replacement part for BD Diesel compound kits and for custom installations using an S400 turbo with a full Marmon 4.2" flange. Some applications may require modification.

Does this include the clamps?

Yes. This kit includes the turbo V-band clamp and the exhaust band clamp needed to connect the downpipe to a 4" exhaust system.

What turbo flange does this downpipe fit?

This downpipe is designed for S400 turbochargers using a full Marmon 4.2-inch flange.

Specifications for BD DIESEL PRODUCTS 1045240