MBRP DS9401 4" T-409 SS Down-Pipe for 1994-02 Dodge Ram 2500/3500 5.9L Cummins

Vehicle Fitment

• 1994-2002 Dodge Ram 2500/3500 (5.9 L Cummins I6, diesel)

Features

• 4.00" diameter T-409 stainless steel mandrel-bent tubing for improved exhaust flow
• Direct-fit down-pipe engineered for the Dodge Ram 5.9L Cummins diesel platform
• Designed to reduce back-pressure and lower exhaust gas temperatures (EGTs)
• Improves turbo spool-up and throttle response under load
• Bolt-on installation using factory mounting points for simplified fitment
• Durable T-409 stainless steel construction with long life for heavy-duty use
• Not legal for use in California or states with CARB-equivalent emissions regulations
• Supports high-flow aftermarket mid-pipes and exhaust systems

Specifications

• Part Number: DS9401
• Piping Diameter: 4.00" (≈ 101.6 mm)
• Material: T-409 Stainless Steel
• Fitment Years: 1994-2002 Dodge Ram 2500/3500 with 5.9 L Cummins engine
• Warranty: Lifetime limited warranty (for T-409 variant)

Included Components

• 1x down-pipe assembly (4" T-409 stainless steel)
• 1x mounting hardware kit (gaskets, bolts, nuts, clamps)
• 1x installation instruction sheet

Product Description

The MBRP DS9401 down-pipe is a high-flow performance upgrade for Dodge Ram 2500/3500 trucks equipped with the 5.9 L Cummins diesel engine (1994-2002). Featuring a large 4" diameter and durable T-409 stainless steel construction, this pipe helps reduce flow restrictions, lower EGTs and enhance turbo efficiency.

With its direct-fit design using factory mounting locations, the DS9401 simplifies installation for heavy-duty diesel builds. Whether you're towing, upgrading turbos or putting together a full exhaust system, this down-pipe gives you the strong foundation needed for durability and performance.

Note: Fitment beyond 2002 is unconfirmed at time of listing. Always verify your exact engine, turbo configuration and exhaust layout before installation. Also ensure local regulations allow aftermarket down-pipes, as this part is not emissions-legal in all jurisdictions.