5th Gen Exhaust Manifold for 6.7 Cummins | 2019–2024 Ram 2500/3500 | High-Flow 2-Piece OEM Replacement
The Diesel Power Source® 5G exhaust manifold is a direct OEM replacement for the factory exhaust manifold on 2019–2024 Ram 2500 and 3500 pickup trucks with the 6.7L Cummins engine. This high-flow, 2-piece manifold with a divided runner design delivers over 62% improved exhaust flow compared to stock, resulting in faster turbo spool-up, lower exhaust gas temperatures, better fuel economy, and significantly improved durability over the factory casting.
Cast from high-silicon ductile iron with 1/4" thick walls, the DPS 5G manifold is built to handle the sustained heat and load demands of towing, daily driving, and performance applications without the cracking, warping, and shrinkage that plague the factory manifold. It bolts directly to the factory HE300VG turbocharger and retains full EGR compatibility.
Does NOT fit Cab & Chassis models (Ram 3500/4500/5500) without modification. This manifold is designed for 2019–2024 Ram 2500 and 3500 pickup models only. Cab & Chassis trucks use a different manifold-to-exhaust routing and turbo orientation.
Why the 5th Gen Factory Manifold Fails
The 2019–2024 Ram 6.7 Cummins uses a single-piece factory exhaust manifold that handles all six cylinders in one rigid casting. Like previous generations, repeated heat cycling causes the manifold to shrink, warp, and eventually crack. The rear cylinders run the hottest and are typically where cracking appears first. Once the manifold develops a leak, exhaust energy that should be driving the turbocharger escapes through the gap, which raises EGTs, slows turbo response, increases fuel consumption, and accelerates wear on surrounding gaskets and hardware.
The 5th gen platform runs hotter EGTs than previous generations due to tighter emissions calibrations and higher factory power output. This makes the manifold even more susceptible to thermal fatigue, and many 5th gen owners are already experiencing manifold failures at lower mileage than the 4th gen trucks did.
How the DPS 2-Piece Design Solves the Problem
The DPS 5G manifold uses a 2-piece construction with a divided design that allows the front and rear sections to expand and contract independently as the engine heats and cools. This eliminates the internal stress that causes factory manifolds to warp, shrink, and crack. The two pieces are pressed together and pressure-tested before shipping, arriving as one assembled, ready-to-install unit.
The divided runner design also improves exhaust pulse separation between cylinder groups, delivering cleaner pulse energy to the turbocharger's twin-scroll inlet. This is a meaningful performance improvement over the factory manifold's open-collector design, and it's a key reason the DPS manifold flows over 62% more than stock.
Key Features
- Over 62% Improved Exhaust Flow — Significantly outflows the factory manifold for faster turbo spool, lower EGTs, and improved engine efficiency
- 2-Piece Divided Design — Allows independent thermal expansion to prevent cracking, warping, and port misalignment
- High-Silicon Ductile Iron — Resists thermal fatigue and withstands extreme temperatures without warping
- 1/4" Thick Wall Construction — Significantly heavier and more durable than the factory casting
- Fully EGR Compatible — Retains factory emissions system routing for street and towing applications
- OEM Turbo Flange Fitment — Bolts directly to the factory HE300VG turbocharger with no modifications
- Pre-Drilled for Pyrometer — Ready for EGT probe installation
- Fully Assembled and Pressure Tested — Ships ready to install
- Designed and Manufactured in the USA
Fitment
This manifold fits 2019–2024 Ram 2500 and 3500 pickup trucks with the 6.7L Cummins engine and factory HE300VG turbocharger.
Does NOT fit Cab & Chassis models (Ram 3500/4500/5500 Cab & Chassis) without modification. These trucks use a different manifold configuration and exhaust routing.
Does NOT fit 2018 and earlier Ram trucks. The 5th gen (2019+) uses a different manifold design than the 4th gen. If you have a 2007.5–2018 truck, see: T4i Exhaust Manifold for 6.7 Cummins 2007.5–2018
What's Included
- (1) DPS 5G 2-piece exhaust manifold for 6.7L Cummins (fully assembled, pressure tested)
- All gaskets and necessary hardware for a complete installation
Optional Upgrades (Sold Separately)
- 5G Multi-Layer Gasket Kit — Upgraded multi-layer steel gaskets for superior sealing under higher heat and boost
- Spin Lock Bolt Kit — Serrated flange bolts that resist loosening through heat cycles
- Turbocharger Mounting Gasket for 2019–2024 Ram 6.7L
OEM Part Numbers Replaced
This DPS 5G manifold is a direct replacement for the following factory part numbers used on 2019–2024 Ram 6.7L Cummins pickup trucks:
- Cummins 5450589
- Mopar 68444858AA
- 708776AT
Common 5th Gen Exhaust Manifold Failure Symptoms
If your 2019–2024 Ram is showing any of these signs, the exhaust manifold may be cracked, warped, or leaking:
- Ticking or hissing noise at cold start that fades as the engine warms
- Visible soot or black residue around manifold-to-head gasket surfaces
- Higher than normal EGTs under load or towing
- Slower turbo spool or reduced boost pressure
- Exhaust smell in the cab or engine compartment
- Decreased fuel economy without other explanation
Which 6.7 Cummins Manifold Do You Need?
| Manifold | Turbo Compatibility | Best For |
|---|---|---|
| 5G Exhaust Manifold (this product) | Factory HE300VG (5th gen turbo) | 2019–2024 Ram 2500/3500 pickup trucks |
| T4i Stock Replacement | Factory HE351VE / HE300VG (T4i flange) | 2007.5–2018 Ram 2500/3500 pickups keeping the factory turbo |
| T4 Performance Manifold | Aftermarket S300/S400 turbos (T4 flange) | 2007.5–2018 trucks upgrading to an aftermarket T4 turbocharger |
Why Choose Diesel Power Source?
- Over 62% More Exhaust Flow — Dramatically outflows the factory manifold for measurable performance improvement
- 2-Piece Divided Design — Eliminates cracking and shrinkage while improving exhaust pulse energy delivery
- 1/4" Thick-Wall Ductile Iron — Built heavier and stronger than the factory casting for commercial-grade durability
- Direct OEM Replacement — Bolts to the factory turbo and retains full EGR compatibility
- Pressure Tested — Every manifold is tested before it ships
- Designed and Manufactured in the USA
Warranty
This Diesel Power Source® 5G exhaust manifold includes a 1-year limited warranty and is backed by our technical support team.
Related 6.7 Cummins Products
- 5G Multi-Layer Gasket Kit (2019–2024)
- Turbocharger Mounting Gasket for 2019–2024 Ram 6.7L
- Spin Lock Manifold Bolt Kit
- T4i Exhaust Manifold for 2007.5–2018 6.7 Cummins
- HE300VG Replacement Turbo for 6.7 Dodge Ram Cummins
- 6.7 Cummins Compound Turbo Kit
- Blog: Why This 6.7L Cummins Exhaust Manifold Is a Must Have for Your 2019–2024 Ram
Frequently Asked Questions
This manifold is designed for 2019–2024 Ram 2500 and 3500 pickup models only. It will not fit Cab & Chassis models (Ram 3500/4500/5500) without modification. Cab & Chassis trucks use a different manifold-to-exhaust routing and turbo orientation than the pickup platform.
Yes. This manifold uses the factory turbo flange and bolts directly to the HE300VG turbocharger found on 2019–2024 Ram 6.7L Cummins trucks. No adapters or modifications are needed.
The factory manifold is a single-piece casting that handles all six cylinders in one rigid structure. Repeated heat cycling causes the casting to shrink and warp over time, misaligning the exhaust ports with the cylinder head. This leads to gasket failures, exhaust leaks, and visible cracks, particularly around the rear cylinders where temperatures are highest. The 5th gen platform runs hotter EGTs than previous generations, which makes the manifold even more susceptible to thermal fatigue.
The DPS 5G manifold flows over 75% more than the factory manifold. This improvement comes from the divided runner design, optimized port geometry, and reduced internal restriction. The increased flow directly translates to faster turbo spool-up, lower exhaust gas temperatures, and improved fuel efficiency.
This manifold replaces Cummins part number 5450589, Mopar part number 68444858AA, and cross-reference number 708776AT.
1 Review
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5G Manifold
I have replaced my stock manifold twice. This one appears to be a much better quality. Was as easy to install as stock and looks great. Super fast shipping.
