3rd Gen 5.9L Cummins T3 Manifold Hardware & Gasket Upgrade Kit | 2003–2007 Common Rail
The Diesel Power Source® 3rd Gen 5.9L Cummins T3 Manifold Hardware & Gasket Upgrade Kit is a complete add-on package designed to fully install the DPS 3rd Gen T3 Exhaust Manifold on 2003–2007 5.9L Common Rail Cummins engines. It includes every gasket and fastener needed for both the manifold-to-head install and the T3 turbo flange install — sourced together so you don't have to chase parts mid-build.
This kit replaces the standard flange bolts found in the manifold's base hardware kit with a full stud-and-nut configuration, the preferred mounting method for high-EGT applications. Multi-Layer Steel (MLS) gaskets resist burnout, blow-through, and warping far better than single-layer alternatives, and both divided and non-divided T3 turbo gaskets are included so the kit fits either housing style.
Designed as the recommended upgrade to the DPS 3rd Gen T3 Exhaust Manifold (MAN0161). The base kit included with the manifold ships with standard flange bolts. This upgrade adds the gaskets, stud-and-nut hardware, and turbo install components needed to complete a full T3 manifold and turbo install in one purchase — with hardware sized to fit either the factory HE351CW turbo or an aftermarket S300-style T3 turbo.
Why Upgrade From the Base Hardware Kit
The base hardware kit shipped with the DPS 3rd Gen T3 manifold gets the manifold mounted to the head — but it doesn't include MLS gaskets, turbo flange hardware, or the gaskets required to bolt your turbo on. This upgrade kit adds all of those components in a single SKU.
Stud-and-Nut Mounting
Studs provide more consistent clamping load than bolts and resist fastener fatigue from repeated thermal cycling — critical for an exhaust manifold that sees hundreds of heat cycles a year. Studs also make future manifold removal far easier; you back off nuts instead of breaking loose corroded bolt threads in the head.
Multi-Layer Steel Gaskets
MLS gaskets use stacked stainless layers to seal the variable surfaces between the manifold and head. They handle higher boost, higher EGTs, and more aggressive tuning than single-layer gaskets without burning through or warping.
Both T3 Gasket Styles Included
Whether your turbo runs a divided or a non-divided T3 housing, the correct gasket is in the box. No second order, no waiting on shipping when the truck is mid-build.
Hardware for Both Stock and Aftermarket Turbos
The kit includes the standard turbo mounting studs that fit either the factory HE351CW or an aftermarket S300-style T3 turbo. For aftermarket S300 installs, the kit also includes one longer through-stud that passes through two mounting holes on the S300 turbo and is secured with a nut on each side. If you're keeping the factory HE351CW, the long stud isn't needed and you simply leave it unused. Either way, you don't need to specify which turbo you're running at checkout.
Who This Kit Is For
- Owners of 2003–2007 Dodge Ram 2500 and 3500 trucks running the 5.9L Common Rail Cummins (3rd gen)
- 3rd gen Cummins builders installing the DPS 3rd Gen T3 Exhaust Manifold (MAN0161)
- Trucks keeping the factory HE351CW turbo
- Trucks upgrading to an aftermarket S300-style T3 turbo
- Tow, daily driver, and mild-to-moderate performance builds
- Builders who want all install hardware and gaskets in a single purchase
What's Included
| Qty | Component | Purpose |
|---|---|---|
| 6 | Multi-Layer Steel Manifold-to-Head Gaskets | Seals manifold to cylinder head |
| 1 | T3 Divided Turbo Flange Gasket | For divided T3 housings |
| 1 | T3 Non-Divided Turbo Flange Gasket | For non-divided T3 housings |
| 1 | Turbo Oil Drain Gasket | Seals oil drain line to turbo |
| 12 | M10-1.5 × 20-12-16 Manifold Studs | Replaces base-kit flange bolts |
| 12 | M10-1.5 Manifold Flange Nuts | Pairs with manifold studs |
| 4 | M10-1.5 × 20-12-16 Turbo Studs | Mounts factory or aftermarket T3 turbo |
| 1 | M10-1.5 × 20-20-16 Through-Stud (long) | Aftermarket S300 turbo only — passes through two holes with nut on each side |
| 1 | M10-1.5 × 45mm Flange Bolt | Turbo mounting hardware |
| 5 | M10-1.5 Turbo Flange Nuts | Pairs with turbo studs |
Key Features
- Full stud-and-nut manifold mounting — replaces the base kit's standard flange bolts
- Multi-Layer Steel manifold gaskets — built for high boost and high EGTs
- Both divided and non-divided T3 gaskets — fits either turbo housing style
- Hardware fits factory or S300 turbo — no need to specify which turbo at checkout
- Complete turbo mounting hardware — studs, bolts, nuts, oil drain gasket
- Direct fit for the DPS 3rd Gen T3 Exhaust Manifold (MAN0161) — no machining or modifications
- Single-source convenience — every gasket and fastener for the install in one SKU
Benefits
- Reduces manifold-bolt loosening and fastener fatigue from repeated heat cycling
- Improves long-term sealing under boost, towing, and performance tuning
- Makes future manifold removal easier — back off nuts instead of fighting seized bolts
- Eliminates the need to source MLS gaskets and stud kits from multiple suppliers
- Covers both T3 turbo housing styles in one kit
Fitment
- 2003–2007 Dodge Ram 2500 / 3500 — 5.9L Common Rail Cummins (3rd gen)
- Pairs with the Diesel Power Source® 3rd Gen T3 Exhaust Manifold (MAN0161)
- Compatible with factory HE351CW turbo and aftermarket S300-style T3 turbos
- Works with both divided and non-divided T3 turbo housings
Note: This kit is the upgrade hardware and gasket package for the 3rd Gen T3 manifold. It does not fit the 6.7L Cummins, 24V VP44, or 12V manifolds — those use different hardware sets. See related products below for the correct kit if you have a different generation.
Pairs With This Kit
Frequently Asked Questions
Not strictly. The base hardware kit included with the manifold has the bolts needed to mount the manifold to the head. This upgrade kit is for builders who also want MLS gaskets, a stud-and-nut manifold mount, and the hardware and gaskets to install their T3 turbo at the same time.
Both. The kit includes both T3 gasket styles, so it fits either housing configuration without needing to specify at checkout.
Yes. The factory HE351CW on 2003–2007 trucks uses a T3 flange, so the T3 gaskets and turbo hardware in this kit will mount it to the DPS 3rd Gen T3 manifold.
Yes. The 12 manifold studs and nuts directly replace the flange bolts and stud included in the base kit. No machining, drilling, or modifications are required.
The longer stud is used only for aftermarket S300-style T3 turbos, where it passes through two mounting holes and is secured with a nut on each side. If you're keeping the factory HE351CW, you don't need the long stud — just leave it unused. Including it means one kit covers both turbo configurations without needing to specify at checkout.
