Product Description
Bolt on HX40 performance the right way. The INDUSTRIAL INJECTION HX40DP2 is a 4-inch HX40-style (64.5mm Marmon) downpipe for 1994–2002 Dodge/Ram 2500/3500 5.9L Cummins trucks. It’s engineered for a clean fit with HX40-style turbine outlets and comes complete with the clamp for a secure, leak-free connection.
Fitment
- 1994–2002 Dodge/Ram 2500/3500 5.9L Cummins (12-valve & 24-valve)
- For turbos with HX40-style 64.5mm outlet (Marmon flange)
What’s Included
- HX40-style 4" downpipe
- Exhaust clamp (for HX40/Marmon outlet)
Key Features
- 4-inch tubing to reduce backpressure and help spool
- HX40/Marmon 64.5mm outlet—built to mate with HX40-style turbine housings
- Clamp included for a secure, serviceable connection
- Designed for second-gen Cummins (1994–2002) chassis routing
Recommended Parts (CPP Internal Links)
- 4″ & 5″ Exhaust Systems — 1994–1998
- HX40 Downpipes & Accessories (Category)
- MBRP HX40 4″ Downpipe & Clamp (Alternative brand)
Cross-Reference / Alternatives
Helpful Notes
- Verify your turbo uses an HX40-style (64.5mm) outlet. This will not fit HE351 or stock HX35 outlets.
- Final system connection may require trimming or an adapter depending on your exhaust brand and size.
FAQ
Does this fit the factory HX35 turbo?No. This pipe is for HX40-style 64.5mm outlets. For other outlet styles, shop our full downpipe category to match your turbo.
Is the clamp included?Yes, the HX40/Marmon clamp is included for a proper seal at the turbo outlet.
What size exhaust does this downpipe connect to?The outlet is 4″. Most 4″ turbo-back systems will connect; some systems may need an adapter or slight fitment adjustment.
Will this work on both 12-valve and 24-valve second-gen trucks?Yes—1994–2002 5.9L Cummins trucks with an HX40-style turbine outlet.
