MBRP DS9401 4 Inch Downpipe T409 Stainless Steel for Dodge Ram Cummins

The MBRP DS9401 is a 4-inch downpipe designed specifically for 1998.5-2002 Dodge Ram 2500/3500 trucks equipped with the 5.9L Cummins diesel engine. This downpipe is part of MBRP's Armor Plus Series and delivers improved exhaust flow while providing excellent durability and corrosion resistance.

Constructed from T409 Stainless Steel:

This downpipe features T409 stainless steel construction, a value-oriented material that offers superior resistance to penetrating rust compared to aluminized steel. T409 stainless is easy to clean and stands up to demanding conditions, making it an excellent choice for diesel enthusiasts seeking long-term reliability. While highly corrosion-resistant, heavy salt exposure and winter road treatments may accelerate surface oxidation over time.

Mandrel-Bent for Maximum Flow:

Every bend in this downpipe is mandrel-formed to maintain consistent diameter throughout, eliminating restrictions and rippling that crush-bent pipes suffer from. This ensures smooth, unrestricted exhaust flow, which helps your Cummins engine breathe better, produce more power, and run more efficiently.

Key Features:

• 4-inch diameter downpipe for improved exhaust flow
• T409 stainless steel construction for corrosion resistance
• Mandrel-bent tubing maintains consistent inner diameter
• Backed by MBRP's lifetime warranty
• Direct fit for 1998.5-2002 Dodge Ram 2500/3500 with 5.9L Cummins diesel
• Not compatible with catalytic converter-equipped 1998 models

Important Fitment Note:

This downpipe is designed for partial-year 1998 models and 1999-2002 Dodge Ram Cummins trucks without catalytic converters. Do not use on vehicles equipped with catalytic converters. Verify your vehicle configuration before ordering.