Industrial Injection HX40 4" Downpipe & Clamp | 2003-2007 Dodge Ram 5.9L Cummins
Upgrade your 2003-2004 Dodge Ram 5.9L Cummins exhaust connection with the Industrial Injection HX40 4" Downpipe and Clamp, Part # HX40DP3.
Designed for trucks running Industrial Injection PhatShaft Series and HX40-style turbochargers, this downpipe replaces the more restrictive factory-style connection with a larger 4-inch exhaust path. Industrial Injection specifically notes that an HX40 downpipe is required on its 2003-2007 PhatShaft turbo applications, making this a critical installation component when upgrading from the factory turbo setup.
The HX40DP3 is built to provide the proper connection between the turbocharger outlet and the truck’s exhaust system while supporting improved exhaust flow and a cleaner aftermarket turbo installation.
Features & Benefits
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Designed for 2003-2007 Dodge Ram 2500 and 3500 5.9L Cummins
- Industrial Injection Part Number: HX40DP3
- 4-inch HX40-style turbo downpipe
- Includes matching exhaust clamp
- Designed for Industrial Injection PhatShaft and other compatible HX40-style turbochargers
- Required for many Industrial Injection 2003-2004 PhatShaft turbo installations
- Larger exhaust path than the factory-style 3.5-inch connection
- Helps reduce exhaust restriction
- Supports improved exhaust flow
- Can help promote quicker turbo response and lower EGTs when used as part of a properly matched turbo and exhaust setup
- Mandrel-bent design helps maintain smoother exhaust flow through the pipe
- Direct-fit installation for compatible turbo and exhaust configurations
Industrial Injection also sells its HX40-style 4-inch V-band clamp specifically for true 4-inch exhaust connections, reinforcing the intended 4-inch outlet configuration of these setups.
Fits Vehicles
Industrial Injection HX40DP3 fits:
- 2003 Dodge Ram 2500 5.9L Cummins
- 2003 Dodge Ram 3500 5.9L Cummins
- 2004 Dodge Ram 2500 5.9L Cummins
- 2004 Dodge Ram 3500 5.9L Cummins
- 2004.5-2007 Dodge Ram 2500/3500 Cummins
Supporting applications for Industrial Injection PhatShaft turbochargers list 2003-2004 Ram 2500 and 3500 trucks and specifically state that the 4-inch HX40-style downpipe and clamp are required for installation on these early 3rd Gen trucks.
Turbo Compatibility
The HX40DP3 is intended for Industrial Injection PhatShaft and HX40-style turbocharger applications that use a 4-inch turbine outlet connection.
Industrial Injection specifically calls out the HX40 downpipe as required on its 2003-2007 PhatShaft turbochargers.
It is also commonly used with compatible Silver Bullet and Super PhatShaft turbocharger setups requiring an HX40-style downpipe.
Why Upgrade to a 4" HX40 Downpipe?
The factory 2003-2007 Cummins exhaust connection can become a restriction when upgrading to a larger aftermarket turbocharger.
A properly matched 4-inch downpipe can help:
- Increase exhaust flow away from the turbine
- Reduce exhaust backpressure
- Support lower exhaust gas temperatures
- Improve turbo spool response
- Complement higher-flow turbochargers
- Provide the correct outlet connection for HX40-style turbo setups
Industrial Injection uses an HX40 downpipe in its own Cummins turbo packages and notes benefits such as quicker spool-up and lower EGTs when paired with the appropriate turbo system.
What's Included
- Industrial Injection HX40 4" Downpipe
- Exhaust Clamp
Product Details
Manufacturer: Industrial Injection
Part Number: HX40DP3
Product Type: Turbocharger Downpipe & Clamp
Pipe Diameter: 4"
Engine: 5.9L Cummins
Vehicle: Dodge Ram 2500 / 3500
Years: 2003-2007
Turbo Style: HX40 / Industrial Injection PhatShaft
Condition: New
Important Fitment Note
This downpipe is designed for trucks equipped with a compatible HX40-style or Industrial Injection PhatShaft turbocharger. It is not intended as a universal replacement for every factory turbocharger configuration.
Verify your turbocharger outlet and exhaust setup before ordering. If you are unsure whether the HX40DP3 is correct for your truck, contact us for application assistance.
