DPS Exhaust Manifold for 6.7 Cummins 2007.5-2018 | Stock Replacement

T4i 2-Piece Exhaust Manifold for 6.7 Cummins | Stock Turbo Replacement | 2007.5-2018 Ram 2500/3500

The Diesel Power Source® T4i exhaust manifold is a direct OEM replacement for the factory exhaust manifold on 2007.5-2018 Dodge Ram 2500 and 3500 trucks with the 6.7L Cummins engine. This manifold uses the factory T4i turbo flange and bolts directly to your stock HE351VE or HE300VG turbocharger with no modifications. CFD testing confirms approximately 72% more exhaust flow than the factory manifold, while solving the cracking, warping, and shrinkage problems that plague the OEM single-piece casting.

Designed using Computational Fluid Dynamics (CFD) testing, the DPS 2-piece design allows the manifold to expand and contract with heat instead of fighting it. The result is a manifold that lasts significantly longer than the factory casting, reduces exhaust gas temperatures by approximately 25-75°F (particularly on the rear cylinders), and improves turbo spool and throttle response.

Why the Factory 6.7 Cummins Manifold Fails

The factory 6.7 Cummins exhaust manifold is a single-piece casting that spans all six cylinders in one rigid structure. Because the 6.7L is a long inline engine, every heat cycle forces that rigid casting to expand and contract across its full length. Over thousands of cycles, the manifold develops cracks and shrinks permanently, shifting the exhaust ports out of alignment with the cylinder head ports. That misalignment drives gasket failures, bolt stress, exhaust leaks, and visible cracking - most commonly around the rear cylinders where temperatures run hottest.

Once the manifold starts leaking, exhaust energy that should be driving the turbine escapes through the gaps. EGTs climb, boost drops, fuel economy suffers, and the problem accelerates. This is one of the most consistent failure points on high-mileage 6.7 Cummins trucks. Replacing a cracked manifold with another factory-style single-piece unit restarts the same cycle.

DPS has tested competitor replacement manifolds in this application and documented approximately 40 HP of power loss on trucks in the 400-450 HP range - the result of oversized runners that slow exhaust velocity and force the turbo to reaccelerate exhaust through the turbine. Runner sizing matters more than runner diameter, and that requires CFD to get right.

How the DPS 2-Piece Design Solves the Problem

The DPS T4i manifold uses a 2-piece design with an expansion joint between the front and rear sections. Each section expands and contracts independently with heat cycling, eliminating the internal stress that causes factory manifolds to warp, shrink, and crack. The two sections are hydraulically pressed together and pressure-tested before shipping, so they arrive as one assembled, leak-verified unit.

Cast from HSMD (High Silicon Molybdenum Ductile iron), the DPS manifold uses material rated approximately 200°F higher than traditional cast iron - a direct structural advantage over the factory casting. The alloy composition also resists the thermal fatigue that initiates cracking in OEM manifolds.

This is also why single-piece stainless steel manifolds are the wrong choice for this engine. Stainless steel expands and contracts at nearly twice the rate of ductile iron. While the manifold itself may not crack, it transfers that expansion force into the cylinder head, head bolts, and gaskets - causing failures in those components instead. The DPS HSMD 2-piece design absorbs thermal movement internally and protects both the manifold and the head.

Key Features

• Approximately 72% More Exhaust Flow - CFD-tested improvement over the factory manifold, with optimized runner sizing for velocity and flow balance
• 2-Piece Expansion Joint Design - Prevents cracking, warping, and port misalignment caused by heat cycling
• HSMD Cast Iron Construction - High Silicon Molybdenum Ductile iron, rated approximately 200°F higher than traditional cast iron
• Lower EGTs - Reduces exhaust gas temperatures approximately 25-75°F, most noticeable under sustained towing or load
• Faster Turbo Spool - Optimized runner design delivers exhaust pulse energy to the turbine more efficiently, improving throttle response
• T4i Turbo Flange - Fits factory HE351VE (2007.5-2012) and HE300VG (2013-2018) turbochargers directly, no adapter needed
• EGR Compatible - Retains factory EGR system connections; two EGR ports match the factory manifold layout
• Pre-Drilled Pyrometer Ports - Two 1/8" NPT ports tapped and ready for EGT probe and pressure sensor installation
• Black High-Temperature Ceramic Coating - Rated for sustained temperatures up to 1,400°F
• Hydraulically Pressed and Pressure-Tested - Every manifold is assembled and verified leak-free before shipping

Specifications

Coating and Heat Rating

DPS T4i manifolds are finished with a black high-temperature ceramic coating rated for sustained exhaust temperatures up to approximately 1,400°F. This reduces surface heat radiation, protects against corrosion, and maintains a clean appearance under normal operating conditions.

About the Manifold Joint Seal

Every DPS multi-piece manifold uses a hard, metal-to-metal press-fit seal at the expansion joint - no gasket. The seal tightens through thermal expansion and performs best at driving temperatures (approximately 750°F and above). Minor seepage at cold idle is normal and expected behavior on any joint-style manifold and is not a sign of a defective part.

Every manifold is hydraulically pressed on a precision alignment jig and pressure-tested leak-free at room temperature before it leaves the facility. For a full explanation of how the press-fit seal works, why a soapy-water idle test is not a valid diagnostic, and how the multi-piece design outlasts single-piece manifolds:

Understanding DPS Multi-Piece Exhaust Manifolds →

Why Choose Diesel Power Source®?

• CFD-Engineered Flow - DPS employs engineers with multiple degrees in thermal and fluid dynamics running proprietary CFD software. The ~72% flow improvement is measured, not estimated.
• 2-Piece Expansion Joint - Addresses the root cause of factory manifold failure, not just the symptom
• HSMD Material - Higher-temperature alloy than traditional cast iron; resists the thermal fatigue that initiates cracking
• Direct OEM Replacement - Bolts to the factory turbo (T4i flange) with no modifications, no adapters
• EGR Compatible - Works with the factory emissions system; two EGR ports in the correct locations
• 100% Pressure Tested - Every manifold is tested before it ships

Fitment

This manifold fits 2007.5-2018 Dodge Ram 2500 and 3500 pickup trucks with the 6.7L Cummins engine and factory HE351VE (2007.5-2012) or HE300VG (2013-2018) turbocharger.

• 2007.5 Dodge Ram 2500 6.7L Cummins
• 2008 Dodge Ram 2500 6.7L Cummins
• 2009 Dodge Ram 2500 6.7L Cummins
• 2010 Dodge Ram 2500 6.7L Cummins
• 2011 Dodge Ram 2500 6.7L Cummins
• 2012 Dodge Ram 2500 6.7L Cummins
• 2013 Ram 2500 6.7L Cummins
• 2014 Ram 2500 6.7L Cummins
• 2015 Ram 2500 6.7L Cummins
• 2016 Ram 2500 6.7L Cummins
• 2017 Ram 2500 6.7L Cummins
• 2018 Ram 2500 6.7L Cummins
• 2007.5-2018 Ram 3500 6.7L Cummins (pickup body only)

Does NOT fit:

• 2013-2018 Ram 3500/4500/5500 Cab & Chassis - different EGR port count and routing; contact DPS with photos for case-by-case evaluation
• 2019+ Ram 2500/3500 - 5th Gen uses a different manifold flange and turbo position. See: 5G Exhaust Manifold for 2019-2024 Ram 6.7L Cummins
• Any truck with an aftermarket T4 turbocharger - use the T4 Performance Manifold instead

What's Included

• DPS 2-piece T4i exhaust manifold for 4th Gen 6.7L Cummins (MAN0140)
• Black high-temperature ceramic coating applied
• Manifold mounting hardware (base kit)

Optional Upgrades (Available Above)

• Complete Hardware & Gasket Kit - adds MLS manifold gaskets, Spin Lock stud-and-nut mounting hardware, T4i turbo install components, and EGR cooler mounting hardware for a complete install. Strongly recommended - do not reuse OEM gaskets.
• EGR Plate Kit - large and small EGR block-off plates for trucks that have removed the factory EGR system. For off-road and competition use only.

Installation Notes

• Direct fit for factory HE351VE (2007.5-2012) and HE300VG (2013-2018) turbochargers
• Pickup truck application only - does not fit Cab & Chassis models
• New gaskets required - do not reuse OEM gaskets
• Anti-seize is not required or recommended on this manifold
• Hot torque recommended: re-torque all manifold and turbo bolts after approximately 100 miles of break-in driving
• For trucks retaining factory EGR: the EGR cooler mounting hardware in the upgrade kit is required to remount the cooler after install

OEM Part Numbers Replaced

This DPS T4i manifold is a direct replacement for the following factory Cummins and Mopar part numbers:

• Cummins: 5301441
• Mopar/Chrysler: 5135788AB, 5135788AC, 68027070AA, 68027070AB, 68210184AA, 68210184AB, 68482545AA

Common 6.7 Cummins Exhaust Manifold Failure Symptoms

If your truck is showing any of these signs, the exhaust manifold may be cracked, warped, or leaking:

• Ticking or hissing noise at idle that fades as the engine warms up
• Visible soot or black residue around the manifold-to-head gasket area
• Higher than normal EGTs, especially under load or towing
• Slower turbo spool or reduced boost pressure
• Exhaust smell in the cab or engine compartment
• Recurring gasket failures after previous manifold bolt re-torques

Which 6.7 Cummins Manifold Do You Need?

Bundle Option

Manifold and turbo failures feed each other on high-mileage 6.7 trucks - restricted exhaust flow accelerates turbo wear, and a worn turbo raises EGTs that stress the manifold. Replacing both in one job eliminates multiple failure points at one labor cost. If your turbo is also due for replacement:

HE300VG Turbo & Exhaust Manifold Package for 2007.5-2018 Ram 6.7L Cummins →

Warranty

This Diesel Power Source® T4i exhaust manifold is backed by our standard warranty. Technical support is available for fitment and installation guidance at 801-930-8404 or sales@dieselpowersource.com.

Warranty registration is required within 14 days of purchase and must include proof of purchase, vehicle registration (VIN), and a completed warranty form. The QR code inside every product package links directly to the registration form, or register at dieselpowersource.com/install-instructions-product-support/.

The black ceramic coating is rated for sustained temperatures up to approximately 1,400°F. Coating discoloration above approximately 1,470°F is not covered under warranty, as it indicates EGT conditions beyond the product's rated operating range.

Related 6.7 Cummins Products

• HE300VG Turbo & Exhaust Manifold Package (2007.5-2018)
• HE300VG Replacement Turbo for 6.7 Dodge Ram Cummins
• Spin Lock Manifold Bolt Kit (2003-2018)
• Multi-Layer Exhaust Manifold Gasket Kit (2007.5-2018)
• T4 Performance Manifold for 6.7 Cummins (Aftermarket Turbos)
• 5G Exhaust Manifold for 2019-2024 Ram 6.7L Cummins
• 6.7 Cummins Compound Turbo Kit (2007.5-2018)
• Add-A-Turbo Kit for 6.7 Cummins (Emissions Compatible)
• 6.7 Cummins Turbo Options