DAP 2-Piece Exhaust Manifold | 03-07 Dodge 5.9L Cummins

Q: Why does the factory 5.9L Cummins exhaust manifold crack?

The factory manifold is a single-piece iron casting. Repeated heat cycles cause the metal to expand and contract, concentrating stress at specific points until the manifold cracks or warps. The 2-piece design on the DAP-T3CRM distributes thermal stress across two shorter sections, reducing the fatigue that causes single-piece manifolds to fail.

Q: Is this a direct bolt-on replacement for the factory manifold?

Yes. The DAP-T3CRM is a stock-style replacement that bolts in where the factory manifold was. Gaskets and manifold-to-cylinder-head hardware are included. Turbo-to-manifold hardware is not included - confirm you have it on hand before starting the install.

DAP 2-Piece Exhaust Manifold - 2003-2007 Dodge Ram 5.9L Cummins

$389.99

Part Number: DAP-T3CRM
Est. Ship Time: Usually Ships in 1-2 Business Days

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Fitment Notice - Hardware Not Included:
This manifold fits 2003-2007 Dodge Ram 5.9L Cummins only. Gaskets and manifold-to-cylinder-head hardware are included. Turbo-to-manifold mounting hardware is not included - source that separately before install.

The DAP-T3CRM is a 2-piece exhaust manifold for the 2003-2007 Dodge Ram 5.9L Cummins, designed as a stock-style replacement built to minimize the cracking and shrinkage issues common in the original single-piece factory unit. Gaskets and manifold-to-cylinder-head hardware are included. This is a direct-replacement fit - not a high-flow performance upgrade.

Is This The Right Manifold For Your Truck?

Buy this if you have a 2003-2007 Dodge Ram 5.9L Cummins and need a stock-style replacement manifold that addresses the shrinkage and cracking problems with the factory single-piece design.
Do not choose this if you are pairing this with an aftermarket turbo upgrade that requires a high-flow T4 manifold - this is a stock-style replacement, not a performance manifold.
Do not choose this if your truck is a 2008 or later Cummins - this fits 2003-2007 only.
Verify before ordering: confirm your truck is a 2003-2007 Dodge Ram 5.9L Cummins, and confirm you have or will source turbo-to-manifold mounting hardware separately.

Why 2-Piece Instead of a Single-Piece Replacement?

The factory 2003-2007 5.9L Cummins exhaust manifold is a single-piece iron casting. Under repeated heat cycles, the manifold expands and contracts - and over time, the metal fatigues, cracks, or warps at the sealing surfaces. A direct single-piece replacement will eventually face the same problem.

The DAP-T3CRM uses a 2-piece design specifically to address this. By splitting the manifold into two sections, thermal expansion and contraction is distributed across two shorter pieces rather than one long casting. This reduces the stress concentration that causes cracking and sealing issues in the stock design. It is still a stock-style replacement in terms of fitment and flow - the difference is durability and longevity over repeated heat cycles.

Stock Replacement vs Performance Manifold:
The DAP-T3CRM is a stock-style replacement - it restores factory exhaust routing with improved durability over the OEM single-piece design.

If you are installing an aftermarket turbo upgrade and need a high-flow T4 manifold, this is not the right part. Look at the DAP high-flow T4 manifold kits designed for those applications.

Fitment Coverage

2003-2007 Dodge Ram 5.9L Cummins
Stock-style replacement - direct fitment

This manifold does not fit 2008 and later Cummins applications. Do not order for post-2007 model years.

What Comes In The Box

DAP 2-piece exhaust manifold
Gaskets
Manifold-to-cylinder-head hardware

Turbo-to-Manifold Hardware Not Included:
The turbo-to-manifold mounting hardware is not included in this kit. If you are reusing your existing hardware, verify condition before install. If you need new hardware, source it separately before your install date.

Avoid These Common Mistakes

Do not assume turbo-to-manifold hardware is included. It is not. Source it separately or reuse your existing hardware in good condition.
Do not order this for a 2008 or later Cummins. This is a 2003-2007 fitment only.
Do not use this manifold if you are upgrading to an aftermarket T4 turbo. This is a stock-style replacement - it is not designed for high-flow T4 performance applications. Use the appropriate high-flow T4 manifold for that install path instead.

Before You Order - Final Check

Truck confirmed as 2003-2007 Dodge Ram 5.9L Cummins
Goal confirmed as stock-style manifold replacement, not a performance upgrade
Turbo-to-manifold hardware plan confirmed - source separately if needed

Checklist confirmed? The DAP-T3CRM is the correct 2-piece stock replacement manifold for your 2003-2007 5.9L Cummins.

Frequently Asked Questions

Click or tap a question below to expand the answer.

Why does the factory 5.9L Cummins exhaust manifold crack?

The factory manifold is a single-piece iron casting. Every time the engine heats up and cools down, the metal expands and contracts. Over thousands of heat cycles, the stress on a long single-piece casting concentrates at specific points - typically around the ports - and eventually causes cracking or warping at the sealing surfaces. The 2-piece design on the DAP-T3CRM distributes that thermal stress across two shorter sections, which reduces the fatigue that causes single-piece manifolds to fail.

Does this manifold fit a 2008 or later Cummins?

No. This manifold fits 2003-2007 Dodge Ram 5.9L Cummins applications only. For 2008 and later model years, you will need a different manifold.

Is the turbo-to-manifold hardware included?

No. The kit includes gaskets and manifold-to-cylinder-head hardware, but turbo-to-manifold mounting hardware is not included. If you need new turbo-to-manifold hardware, source it separately before your install date.

Can I use this manifold with an aftermarket turbo upgrade?

This is a stock-style replacement manifold. If you are installing a performance turbo that requires a high-flow T4 manifold, this is not the right part for that application. Use the appropriate high-flow T4 manifold kit designed for aftermarket turbo installs on the 5.9L Cummins instead.

Is this a direct bolt-on replacement for the factory manifold?

Yes. The DAP-T3CRM is a stock-style replacement designed to bolt in where the factory manifold was. Gaskets and manifold-to-cylinder-head hardware are included. Confirm turbo-to-manifold hardware is on hand before starting the install as it is not included in the kit.