DPS MAN0179 Exhaust Manifold - 2019-2024 6.7L Cummins

The Diesel Power Source MAN0179 is a 2-piece divided exhaust manifold for 2019-2024 Ram 2500 and 3500 pickup trucks with the 6.7L Cummins engine - a high-flow OEM replacement that flows over 62% more than the factory manifold while retaining full EGR compatibility and bolting directly to the factory HE300VG turbocharger. Cast from high-silicon ductile iron with 1/4" thick walls and pressure-tested before shipping, it replaces factory part numbers Cummins 5450589, Mopar 68444858AA, and 708776AT. If your 5th gen is showing exhaust ticking, climbing EGTs under load, or visible soot around the manifold-to-head surface, this is the correct replacement.

Why the 5th Gen Factory Manifold Cracks

The 2019-2024 Ram 6.7L Cummins uses a single-piece factory exhaust manifold that handles all six cylinders in one rigid casting. Repeated heat cycling causes it to shrink, warp, and eventually crack - typically at the rear cylinders where temperatures run highest. The 5th gen platform runs hotter EGTs than previous generations due to tighter emissions calibrations and higher factory power output, which accelerates thermal fatigue. Once the manifold cracks, exhaust energy escapes through the gap instead of driving the turbocharger - raising EGTs further, slowing turbo response, and stressing surrounding gaskets and hardware.

Replacing a cracked stock manifold with another single-piece casting restarts the same failure cycle. The MAN0179 2-piece divided design allows the front and rear sections to expand and contract independently, removing the internal stress that causes factory manifolds to warp and crack. If your 5th gen is showing exhaust tick at cold start, elevated EGTs on the highway, or reduced boost under load, verify fitment and this is the manifold to order.

What the Divided Runner Design Delivers

The divided runner design does two things the factory open-collector manifold cannot: it allows independent thermal expansion between cylinder groups, and it improves exhaust pulse separation before the turbo inlet. Cleaner pulse energy to the HE300VG's twin-scroll inlet means faster spool-up and more efficient turbo response - not just better flow numbers. Combined with 1/4" thick high-silicon ductile iron walls, this manifold handles the sustained heat and load demands of towing, daily driving, and performance applications where the factory casting fatigues.

5th Gen 6.7L Cummins Manifold Failure Signs

Many 2019-2024 Ram owners search out a replacement after noticing an exhaust tick or hissing at cold start that fades as the engine warms, visible soot or black residue along the manifold-to-head gasket surfaces, higher-than-normal EGTs under towing load, sluggish turbo spool or reduced boost pressure, an exhaust smell in the cab, or unexplained drops in fuel economy. These are the common symptoms of a cracked or leaking 5th gen exhaust manifold. The MAN0179 addresses the root cause by replacing the single-piece factory casting with a 2-piece divided design that absorbs thermal stress instead of accumulating it.

What Comes in the Box

Every MAN0179 ships with the base hardware kit (FAS0209) included. Head gaskets and turbo hardware are not included in the base kit - add the Upgraded Hardware Kit at checkout for a complete install.

• DPS 2-piece divided exhaust manifold for 2019-2024 6.7L Cummins pickup
• High-temperature black ceramic coating (1,400°F rated) - factory applied
• Base Hardware Kit FAS0209: 12x M10-1.5 x 35mm serrated flange bolts (manifold to head)

MAN0179 Full Specifications

Check every row against your application - these are the order-gating specs for the 2019-2024 5th gen 6.7L platform.

If your year, platform (pickup), engine, and turbo match the specs above, this is the correct manifold to order.

Installation Overview

Full step-by-step instructions are in the DPS 5G 6.7L Manifold Installation Instructions (PDF). Key install facts from the official instructions:

• Torque: All manifold-to-head, turbo-to-manifold, and EGR fasteners torque to 35 ft-lbs. Apply anti-seize to all bolt and stud threads before installation.
• Tightening sequence: Start at the center bolts and work outward, tightening incrementally before final torque.
• Re-torque required: After approximately 100 miles of driving, re-torque all manifold and turbo fasteners while warm - fasteners can loosen after the first few heat cycles.
• EGR remount: Upgraded kit includes 4x M10-1.5 x 48mm studs and flange nuts (FAS0248) for remounting the EGR cooler to the manifold. Required if retaining the factory EGR system.
• Exhaust pressure sensor tube: Reconnect the exhaust pressure sensor tube to the manifold's sensor port after installation.
• Head gaskets: Not in the base kit - purchase GAS0179 separately or add the Upgraded Hardware Kit.

OEM Cross-Reference Numbers

If your current manifold carries any of these factory part numbers, the MAN0179 is the confirmed direct replacement for your 2019-2024 Ram 6.7L Cummins pickup.

• Cummins 5450589
• Mopar 68444858AA
• 708776AT

5G vs 4th Gen 6.7L Manifold - Which Do You Need?

Both the MAN0179 and MAN0140 fit Ram 6.7L Cummins trucks, but they are not interchangeable. The 5th gen (2019-2024) and 4th gen (2007.5-2018) use different factory turbos, different flange patterns, and different EGR routing. Confirm your model year before ordering.

If your truck is a 2007.5-2018 6.7L Cummins, order the DPS 2-Piece Exhaust Manifold for 2007.5-2018 6.7L Cummins - MAN0140 instead.

About the Expansion Joint Seal

Every DPS multi-piece manifold uses a hard, metal-to-metal press-fit seal at each joint - no gasket. The seal tightens through thermal expansion and performs best at driving temperatures (750°F and higher). Minor seepage at cold start or idle is normal and expected on any joint-style manifold and is not a sign of a defective part. A soapy-water idle test is not a valid diagnostic for this seal style - it needs to be at operating temperature to seat fully.

Ceramic Coating and High-EGT Note

The MAN0179 ships with a black high-temperature ceramic coating rated for sustained temperatures up to 1,400°F. If exhaust gas temperatures exceed approximately 1,450°F, the coating may shift from black to gray. This is a normal result of excessive heat exposure and does not affect the structural integrity or performance of the manifold. Coating discoloration from high-EGT conditions is not covered under warranty.

Fitment Coverage - 2019-2024 6.7L Cummins Pickup

The MAN0179 fits 2019, 2020, 2021, 2022, 2023, and 2024 Ram 2500 and Ram 3500 pickup trucks with the 6.7L Cummins engine and factory HE300VG turbocharger. Pickup body style only - does not fit Cab and Chassis without modification.

Wrong generation or platform? Find the correct DPS manifold below:

• DPS 2-Piece Exhaust Manifold for 2007.5-2018 6.7L Cummins - MAN0140
• DPS 2-Piece T3 Exhaust Manifold for 2003-2007 5.9L Cummins - MAN0161
• DPS 3-Piece T3 Exhaust Manifold for 1998.5-2002 5.9L 24V Cummins - MAN0128
• DPS 3-Piece T3 Exhaust Manifold for 1988-1998 5.9L 12V Cummins - MAN0127

Avoid These Common Mistakes

• Ordering for a Cab and Chassis truck: This manifold does not fit Ram 3500, 4500, or 5500 Cab and Chassis models without modification - different exhaust routing and turbo orientation.
• Ordering for a 4th gen 6.7L: The 2007.5-2018 6.7L Cummins uses a different turbo flange and manifold configuration. See MAN0140 for that application.
• Starting the install without head gaskets: The base kit (FAS0209) does not include manifold-to-head gaskets. Source GAS0179 separately or add the Upgraded Hardware Kit before starting the job.
• Skipping the EGR hardware: If retaining the factory EGR system, the Upgraded Hardware Kit's FAS0248 studs and nuts are required to remount the EGR cooler to the manifold.
• Skipping the re-torque: All manifold, turbo, and EGR fasteners need to be re-torqued to 35 ft-lbs after approximately 100 miles of driving while warm.
• Diagnosing at cold idle: Minor seepage at cold start is normal on joint-style manifolds. The expansion joint seal seats fully at operating temperature - a soapy-water idle test is not a valid diagnostic.

Ready to Order the MAN0179?

• Truck is a 2019-2024 Ram 2500 or 3500 pickup (not Cab and Chassis) with the 6.7L Cummins - confirmed
• Turbo is the factory HE300VG - confirmed
• Upgraded Hardware Kit reviewed - head gaskets (GAS0179) and EGR hardware (FAS0248) not included in base kit

For a 2019-2024 Ram 2500 or 3500 pickup with a cracked or leaking factory manifold, the MAN0179 is the correct replacement - over 62% more flow, divided runner design for better pulse energy delivery, and 1/4" thick ductile iron walls built to outlast the factory casting.

Frequently Asked Questions