Industrial HX40DP2 HX40 4 inch Downpipe | 1998-2002 RAM 2500/3500 5.9L Cummins

Features:

• Fits 1998–2002 Dodge RAM 5.9L Cummins
• Designed for second-generation Cummins trucks
• Required for PhatShaft turbo installations
• Replaces restrictive factory 3-inch downpipe
• Provides proper fitment for HX40 turbo outlet
• Increases exhaust flow and turbo efficiency
• Helps reduce exhaust backpressure and EGTs
• 4-inch diameter for improved performance
• Direct bolt-on replacement with no fabrication
• Ideal for performance and towing applications
• Durable construction for long-lasting reliability
• Compatible with aftermarket exhaust upgrades

Let Your Turbo Breathe With A Bigger Exit Strategy

If you're running a PhatShaft or HX40 turbo on your second-gen Cummins, your stock 3-inch downpipe just isn't cutting it. This 4-inch HX40 Downpipe from Industrial Injection is exactly what your setup needs to let that turbo push exhaust freely and efficiently. With better flow comes lower EGTs, quicker spool-up, and a noticeable bump in performance, especially when you're towing or laying into the throttle. It's a direct-fit replacement that bolts right in without modification, making it a no-brainer for anyone upgrading their turbo system. The increased diameter clears the way for higher-volume exhaust, helping your engine stay cooler and run stronger under load. It also sets the stage for future upgrades, especially if you're pairing it with a full 4-inch or 5-inch exhaust system. For anyone serious about getting the most out of their turbo, this downpipe is a must.

Designed To Match HX40 Flange Geometry And Flow Demands

The Industrial HX40DP2 4-Inch Downpipe is engineered specifically to connect PhatShaft or HX40-style turbochargers to your exhaust system in 1998 through 2002 Dodge RAM 5.9L Cummins applications. Stock downpipes measure only 3 inches, creating a restrictive bottleneck that limits airflow and raises exhaust gas temperatures under heavy use. This upgraded 4-inch version features the correct flange geometry for the HX40 outlet, ensuring a proper seal and consistent fit without any custom fabrication. The larger internal diameter allows for significantly improved exhaust evacuation, which in turn supports better turbo efficiency, reduced backpressure, and improved engine cooling. It’s built from durable materials to handle the heat and stress of high-performance or towing environments. The downpipe is also compatible with most aftermarket exhaust kits, making it a key piece of any performance upgrade path. Whether you're refining your current setup or planning future modifications, this part bridges the gap between airflow needs and daily reliability.

Fits: 1998, 1999, 2000, 2001, 2002 RAM 2500/3500 5.9L Cummins

Notes:

• Designed for 1998–2002 Dodge RAM 2500 and 3500 with 5.9L Cummins
• Required for use with PhatShaft and HX40-style turbos
• Replaces factory 3-inch downpipe with larger 4-inch version
• Ensures proper fit and seal with HX40 turbo outlet flange
• Helps reduce exhaust gas temperatures (EGTs) by improving flow
• Direct bolt-on design requires no cutting or fabrication
• Recommended for performance and towing applications
• Compatible with most aftermarket 4-inch and 5-inch exhaust systems
• Not intended for use with stock turbochargers
• Professional installation recommended for best fit and performance