MBRP DAL405 4" Down-Pipe for 2003-04 Dodge Ram 2500/3500 5.9L Cummins

Vehicle Fitment

• 2003-2004 Dodge Ram 2500/3500 (5.9 L Cummins I6, diesel)

Features

• 4.00" mandrel-bent aluminized steel down-pipe for improved exhaust flow
• Direct-fit design using factory turbo mounting points - no major modifications
• Reduces back-pressure and lowers exhaust gas temperatures for better performance
• Durable aluminized steel construction suitable for heavy-duty diesel use
• Bolt-on installation for simplified fitment and alignment
• Compatible with aftermarket mid-pipes and full exhaust systems
• Enhances turbo spool-up and throttle response in diesel trucks
• Not CARB-legal in California or other emissions-restricted states

Specifications

• Part Number: DAL405
• Piping Diameter: 4.00" (≈ 101.6 mm)
• Material: Aluminized steel
• Fitment Years: 2003-2004 Dodge Ram 2500/3500 5.9 L Cummins
• Warranty: 3-year limited warranty on aluminized steel

Included Components

• 1x 4" aluminized down-pipe assembly
• 1x mounting hardware kit (gaskets, bolts, nuts, washers)
• 1x installation instruction sheet

Product Description

The MBRP DAL405 down-pipe is engineered for Dodge Ram 2500/3500 trucks with the 5.9 L Cummins diesel engine from 2003-2004. Its 4.00" aluminized steel construction improves exhaust flow, reduces back-pressure, and helps lower exhaust gas temperatures, enhancing turbo performance and overall engine efficiency.

This direct-fit kit installs using factory turbo mounting points, simplifying installation. Ideal for towing, aftermarket turbo upgrades, or full exhaust systems, it delivers durable performance without major modifications.

Fitment beyond 2004 is unconfirmed. Installation should be done by a qualified technician, and local emissions regulations should be checked before use.