T4 Center Mount Exhaust Manifold for Cummins 1998.5–2018 | For Aftermarket Turbos | **NOT OEM
Important: This is NOT an OEM manifold. This T4 center mount manifold is designed exclusively for aftermarket T4-flange turbochargers (S300, S400, and similar). It will NOT fit factory Holset turbochargers (HX35, HY35, HE341, HE351CW, HE351VE, HE300VG), which use T3 or T4i flanges. If you need a stock replacement manifold, see our T3 manifold for 24V Cummins or T4i manifold for 6.7 Cummins.
The Diesel Power Source® T4 center mount exhaust manifold is a 3-piece performance manifold with a center-dump T4 turbo flange for 1998.5–2018 Dodge Ram trucks with the 5.9L 24-valve or 6.7L Cummins engine. This manifold mounts aftermarket T4-flange turbochargers in the center (2nd gen) turbo position and is designed for owners upgrading to larger S300, S400, or other T4-flange turbos for high-horsepower single turbo builds, compound turbo setups, sled pulling, or performance towing applications.
Cast from ductile iron with CFD-tested runner geometry, this manifold flows significantly more exhaust than the factory manifold while maintaining the exhaust gas velocity needed for fast turbo spool-up. The 3-piece expansion joint design eliminates the cracking and warping that destroys factory and single-piece aftermarket manifolds, including stainless steel competitors.
Who Needs a T4 Manifold?
A T4 manifold is required when upgrading from the factory turbocharger to an aftermarket turbo with a T4 inlet flange. The factory 5.9 and 6.7 Cummins manifolds use T3 or T4i flanges, which are not compatible with larger T4-flange turbos. If you are running or planning to install any of the following, you need this manifold:
- S300 turbos with T4 exhaust housing — S362, S363, S366, S369 in T4 configuration
- S400 turbos — S467, S472, S475, S478, S480, S483
- Compound turbo setups where the high-pressure turbo uses a T4 flange
- 2nd gen swap configurations on 2003–2018 trucks using a center-mount turbo position
- High-horsepower single turbo builds exceeding the airflow capacity of T3-flange turbos
- Sled pulling and drag racing builds using large-frame turbochargers
If you are keeping your factory turbo or using a T3-flange aftermarket turbo, you do not need this manifold. Use the appropriate T3 manifold for your generation instead.
Why the DPS T4 Over Steed Speed or Other Competitors
The DPS T4 center mount manifold is cast from ductile iron with a 3-piece expansion joint design. This is a critical advantage over competitor manifolds, including the Steed Speed T4:
- Stainless steel manifolds (including Steed Speed) expand and contract up to 2x more than ductile iron during thermal cycling. This extra movement stresses the cylinder head, head bolts, and gaskets, causing leaks and failures in those components over time.
- Single-piece manifolds cannot flex with temperature changes. They either crack (cast iron) or transfer all expansion force into the head (stainless).
- The DPS 3-piece design absorbs thermal expansion through the expansion joints, protecting both the manifold and the cylinder head. It stays tight, aligned, and sealed through thousands of heat cycles.
DPS designs all manifolds using CFD (Computational Fluid Dynamics) testing to optimize runner sizing and flow balance. Oversized runners from some competitors actually slow exhaust gas velocity, causing the exhaust to bottleneck at the turbo flange. DPS has tested competitor manifolds that decreased horsepower by 40 HP on a 400 HP truck due to oversized runner designs.
Key Benefits of the T4 Upgrade
- Increased Airflow — The T4 flange and optimized runners support higher exhaust volume for large-frame turbochargers that T3-flange manifolds cannot feed
- Lower Drive Pressure and EGTs — Reduced restriction through the manifold lowers exhaust backpressure and exhaust gas temperatures, especially under sustained load
- Turbocharger Flexibility — Enables the use of S300 (T4 config), S400, and other large-frame turbos not compatible with smaller factory flanges
- Faster Turbo Spool — CFD-tested pulse-divided design delivers exhaust energy efficiently to the turbine for improved throttle response
- Crack-Resistant 3-Piece Design — Expansion joints handle thermal cycling without the cracking that destroys factory and single-piece manifolds
- Center Mount Position — Turbo mounts in the center (2nd gen) location for optimal exhaust routing and clearance
Specifications
| Specification | Value |
|---|---|
| Design | 3-piece expansion joint, center dump |
| Material | Ductile iron |
| Turbo Flange | T4 (center mount) |
| Coating | Black high-temperature ceramic (1,400°F rated) |
| Pyrometer Ports | 2 drilled and tapped (pyro and boost pressure) |
| CARB Status | Not CARB certified |
| OEM Replacement | No — this is NOT an OEM replacement |
| Included Hardware | Block gaskets and two bolts |
| Fitment | 1998.5–2018 Cummins 5.9L 24V and 6.7L with aftermarket T4 turbo |
T3 vs T4 — Which Manifold Do You Need?
| Feature | T3 Manifold (Stock Replacement) | T4 Center Mount (This Product) |
|---|---|---|
| Turbo Flange | T3 (fits factory and most S300 turbos) | T4 (fits aftermarket S300 T4, S400, and larger turbos) |
| Stock Turbo Compatible | Yes | No — aftermarket T4 turbos only |
| Best For | Stock replacement, towing, daily driving, moderate S300 builds | High HP builds, S400 turbos, compounds, sled pulling, 2nd gen swaps |
| CARB Exempt | Yes | No |
| Turbo Position | Factory location | Center mount (2nd gen position) |
What's Included
- DPS 3-piece T4 center mount exhaust manifold
- Black high-temperature ceramic coating
- Block gaskets and two bolts
Optional upgrades (available at checkout):
- Serrated Spin-Lock Bolt Kit — upgraded bolts with teeth to prevent loosening
- Multi-Layer Gasket Kit — improved sealing over standard gaskets
Note: When selecting the Spin Lock Bolt or Multi-Layer Gasket Kit upgrade, the standard bolts and gaskets are not included. The upgraded components replace them.
Black High-Temperature Coating
DPS exhaust manifolds are finished with a high-temperature black ceramic coating designed to handle extreme heat and real-world diesel performance conditions. This coating is rated for sustained temperatures up to 1,400°F, helping reduce surface heat, improve durability, and maintain a clean appearance under normal operating conditions.
Please note: The black ceramic coating is rated for temperatures up to 1,400°F. If exhaust gas temperatures exceed approximately 1,470°F, the coating may discolor and shift to a gray appearance. This is a normal result of excessive heat exposure and does not affect the performance or structural integrity of the manifold. Warranty does not cover coating discoloration or finish changes due to high EGT conditions.
Fitment
This T4 center mount manifold fits 1998.5–2018 Dodge Ram 2500 and 3500 trucks with the 5.9L 24-valve or 6.7L Cummins engine when upgrading to an aftermarket turbo with a T4 inlet flange. The center dump design places the turbo in the 2nd gen (center) position.
This manifold will NOT fit factory turbochargers. Factory Holset turbos (HX35, HY35, HE341, HE351CW, HE351VE, HE300VG) use T3 or T4i flanges, not T4. This manifold is for aftermarket T4-flange turbos only.
Need a stock replacement manifold?
- T3 Manifold for 24V Cummins 1998.5–2002 (Stock Replacement)
- T3 Manifold for 5.9 Cummins 2003–2007 (Stock Replacement)
- T4i Manifold for 6.7 Cummins 2007.5–2018 (Stock Replacement)
Related Products
Frequently Asked Questions
No. This is NOT an OEM manifold. The T4 flange will not fit factory Holset turbochargers (HX35, HY35, HE341, HE351CW, HE351VE, HE300VG), which use T3 or T4i flanges. This manifold is designed exclusively for aftermarket T4-flange turbochargers such as S300 (T4 config), S400, and other large-frame turbos. If you need a stock replacement, see our T3 or T4i manifolds for your specific Cummins generation.
Center mount refers to the turbo mounting position. This manifold uses a center dump design that places the turbo in the 2nd gen (center) position on the engine, rather than the offset position used on some 2003+ factory configurations. This is the standard turbo location for 2nd gen swap setups and most aftermarket T4 turbo installations on 1998.5–2018 Cummins trucks.
Steed Speed manifolds are stainless steel, which expands and contracts up to 2x more than ductile iron during heat cycles. That extra movement transfers stress directly to the cylinder head, head bolts, and gaskets, causing leaks and failures. The DPS T4 is cast from ductile iron with a 3-piece expansion joint design that absorbs thermal movement without stressing the head. Additionally, DPS uses CFD testing to optimize runner sizing — competitor manifolds with oversized runners have been tested and shown to decrease horsepower by 40 HP on a 400 HP truck.
This manifold fits 1998.5–2018 Dodge Ram 2500 and 3500 trucks with the 5.9L 24-valve or 6.7L Cummins engine when using an aftermarket turbocharger with a T4 inlet flange. It covers 2nd gen 24V (1998.5–2002), 3rd gen common rail (2003–2007), and 4th gen 6.7L (2007.5–2018) applications.
No. This T4 performance manifold is not CARB certified. The DPS T3 stock replacement manifolds for each Cummins generation are CARB exempt.
Yes. Block gaskets and two bolts are included. You can upgrade to the Serrated Spin-Lock Bolt Kit and Multi-Layer Gasket Kit at checkout. When selecting upgrades, the standard hardware is replaced by the upgraded components.
7 Reviews
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Perfect 2nd gen swap
Installed this on my 06 with a full 2nd gen swap and S467. Turbo placement is exactly where it should be. Downpipe and intake routing came together way easier than expected. Manifold quality is solid and no issues after a few heat cycles.
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Better than Stock
Switched from a T3 setup to this with a T4 S369 and the truck woke up. Lower drive pressure and EGTs dropped noticeably on long pulls. You can tell it’s designed to actually move air instead of just being a replacement piece.
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Good manifold
Works great but this is NOT for stock turbo guys. Had a buddy order one thinking it would fit his factory setup and it won’t. Once I paired it with my S366 T4 it worked perfectly. Just make sure your setup matches.
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No Leaks
The 3 pcdesign is the biggest reason I went with this. After towing and a bunch of heat cycles, everything is still sealed up tight. No ticking, no cracked sections like I’ve had before.
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T4 center mount manifold
Exactly what I needed and they shipped it out fast and free! 5 stars
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T4 24v manifold
Price is good considering no tax and free shipping to comiefornia where you can barely get anything fun at all. DPS is great company and I’m glad to be a member. Will buy from them again!!
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Customer Service
I ordered this part by mistake and had to return it because it would not fit my truck. Diesel Power Source are great people to work with I would definitely buy from them again.
