MBRP DS9405 4in T409 SS XP Series Downpipe for 2003-2004 Dodge Ram 5.9L Cummins

Vehicle Fitment

• 2003-2004 Dodge Ram 2500/3500 (5.9L Cummins Diesel)

Fitment Notes

• Direct bolt-on to factory hangers; no cutting or welding required for the downpipe itself
• Emissions Note: This is an aftermarket downpipe intended for off-road/competition use; it is not CARB-legal and is restricted from sale/shipment to California residents

Features

• Mandrel-bent, jig-manufactured construction for accurate, consistent fitment
• 16-gauge T409 stainless steel construction resists rust and corrosion
• Increases exhaust flow over the stock downpipe
• Helps reduce exhaust gas temperatures (EGTs)
• Retains all factory mounting points for straightforward installation
• Part of MBRP's XP Series performance lineup
• Backed by a lifetime warranty on the stainless steel construction
• Designed to complement other performance upgrades (intakes, programmers, downloaders)

Specifications

• Inlet Diameter: 4.00in
• Outlet Diameter: 4.00in
• Material: 16-Gauge T409 Stainless Steel
• Finish: Natural
• Construction: Mandrel-Bent
• Catalytic Converter Included: No
• Oxygen Sensor Bung Included: No
• Hardware Included: No
• Quantity: Sold Individually

Included Components

• 1x MBRP DS9405 4in T409 Stainless Steel Downpipe

Product Description

The MBRP DS9405 is a 4in T409 stainless steel downpipe engineered for the 2003-2004 Dodge Ram 2500/3500 with the 5.9L Cummins diesel engine. As part of MBRP's XP Series lineup, it's built for enthusiasts who want a downpipe that can handle demanding conditions while delivering a noticeable improvement in exhaust flow over the restrictive factory unit.

Constructed from rugged 16-gauge T409 stainless steel and mandrel-bent for smooth, consistent airflow, this downpipe is jig-manufactured to ensure accurate fitment at every factory mounting point. The improved flow helps lower exhaust gas temperatures (EGTs), which can reduce strain on the turbo and engine during hard pulls or towing.

This downpipe is intended for off-road and competition use and is not CARB-legal, so it's not available for sale or shipment to California. It pairs well with other performance upgrades like cold air intakes and tuners, and is backed by MBRP's lifetime warranty on the stainless steel construction. No hardware, catalytic converter, or O2 sensor bung is included, so plan accordingly if your install requires them.