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. It delivers a 72% increase in exhaust flow over the factory manifold while solving the cracking, warping, and shrinkage problems that plague the OEM design.

Designed and manufactured in the USA using CFD (Computational Fluid Dynamics) 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 single-piece casting, reduces exhaust gas temperatures (especially on the rear cylinders), and improves turbo spool-up and throttle response.

Does not fit 2013–2018 Cab & Chassis models (3500/4500/5500). Cab & Chassis trucks use a different exhaust manifold configuration. This manifold fits 2007.5–2018 Ram 2500 and 3500 pickup models only.

Why the Factory 6.7 Cummins Manifold Fails

The factory 6.7 Cummins exhaust manifold is a single-piece casting that handles all six cylinders in one rigid structure. Every time the engine heats up and cools down, that rigid casting expands and contracts. Over thousands of heat cycles, the manifold shrinks permanently, which causes the exhaust ports to shift out of alignment with the cylinder head ports. This misalignment leads to gasket failures, exhaust leaks, and eventually visible cracks in the casting, particularly around the rear cylinders where temperatures run the hottest.

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

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. This joint allows each section to expand and contract independently as the engine heats up and cools down, preventing the internal stress that causes factory manifolds to warp, shrink, and crack. The two pieces are pressed together and pressure-tested before shipping, so they arrive ready to install as one assembled unit.

This is also why we strongly advise against single-piece stainless steel manifolds from other manufacturers. Stainless steel expands and contracts at nearly twice the rate of ductile iron. While the stainless manifold itself may not crack, it transfers that expansion force directly into your cylinder head, head bolts, and gaskets, causing failures in those components instead. The DPS 2-piece ductile iron design absorbs thermal movement internally, protecting both the manifold and the head.

Key Features

• 72% Increased Exhaust Flow — CFD-tested for measurably improved airflow over the factory manifold
• 2-Piece Expansion Joint Design — Prevents cracking, warping, and port misalignment caused by heat cycling
• Lower EGTs — Improved flow reduces exhaust backpressure and cools the rear cylinders where factory manifolds run hottest
• Faster Turbo Spool-Up — Better exhaust pulse energy delivery to the turbine for improved throttle response
• T4i Turbo Flange — Fits the factory HE351VE and HE300VG turbocharger directly, no adapter needed
• Fully EGR Compatible — Retains factory EGR system routing
• Pre-Drilled Pyrometer Ports — (2) tapped ports ready for EGT probe and pressure sensor installation
• Black High-Temperature Finish — Durable coating for heat resistance and corrosion protection
• Fully Assembled and Pressure Tested — Ships ready to install
• Designed and Manufactured in the USA

Fitment

This manifold fits 2007.5–2018 Dodge Ram 2500 and 3500 pickup trucks with the 6.7L Cummins engine and factory HE351VE or HE300VG turbocharger (T4i flange).

Does NOT fit 2013–2018 Cab & Chassis models (Ram 3500/4500/5500 Cab & Chassis). These trucks use a different manifold-to-exhaust routing and turbo position that is not compatible with this manifold.

Does NOT fit 2019+ Ram trucks. The 5th gen uses a different manifold design. See: 5G Exhaust Manifold for 2019–2024 Ram 6.7L Cummins

What's Included

• (1) DPS T4i 2-piece exhaust manifold for 6.7L Cummins (fully assembled, pressure tested)
• 6 single-layer manifold gaskets
• 2 spin lock bolts
• 7 studs
• 7 nuts

Optional Upgrades (Sold Separately)

• Full Spin Lock Bolt Kit — 12-piece spin lock serrated flange bolt set (replaces standard bolts for improved clamping)
• Multi-Layer Gasket Kit — 6 multi-layer steel gaskets plus multi-layer turbo gasket (superior seal under higher boost and heat)

Note: When purchasing the Spin Lock Bolt Kit or Multi-Layer Gasket Kit upgrade, the standard bolts and gaskets that come with the manifold will not be included. The upgrade components replace them.

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

Replacing the turbo and manifold together eliminates multiple failure points in one job. If your turbo is also due for replacement, see the complete bundle:

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

Why Choose Diesel Power Source?

• 72% More Exhaust Flow — CFD-tested for real, measurable improvement over the factory manifold
• 2-Piece Expansion Joint — Solves the cracking and shrinkage problem that factory manifolds are known for
• Direct OEM Replacement — Bolts to the factory turbo (T4i flange) with no modifications
• EGR Compatible — Works with the factory emissions system
• Pressure Tested — Every manifold is tested before it ships
• Designed and Manufactured in the USA

Warranty

This Diesel Power Source® T4i exhaust manifold is backed by our standard warranty and technical support team for fitment and installation guidance.

Related 6.7 Cummins Products

• HE300VG Turbo & Exhaust Manifold Package (2007.5–2018)
• HE300VG Replacement Turbo for 6.7 Dodge Ram Cummins (2007.5–2024)
• 2003–2018 Spin Lock Manifold Bolt Kit
• Multi-Layer Exhaust Manifold Gasket Kit (2007.5–2018)
• T4 Performance Manifold for 6.7 Cummins (Aftermarket Turbos Only)
• 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)

1 Review

• 5

  T4i manifold great install

  Posted by Drew Baker on Jan 29, 2025

  As a mechanic, I've installed several exhaust manifolds on 6.7 Cummins engines, and the DPS T4i Exhaust Manifold really stands out for its ease of installation. The design is well thought out, making it straightforward to align and secure, even in tighter engine bays. Typically, aftermarket parts can be hit or miss, but this manifold fit perfectly without any adjustments needed. It’s a solid choice for anyone looking to upgrade their exhaust system without a hassle. Definitely recommend it for both DIYers and pros alike.