12V Cummins Fummins / RV T3 Manifold Hardware & Gasket Upgrade Kit | 1988–1998 5.9L Swap
The Diesel Power Source® 12V Fummins / Chummins / RV T3 Manifold Hardware & Gasket Upgrade Kit is a complete add-on package designed to fully install the DPS T3 Manifold for 12V Fummins, Chummins, RV & Bus on 1988–1998 5.9L 12-valve Cummins swap 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 T3 Manifold for 12V Fummins, Chummins, RV & Bus (MAN0170). 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 a stock-style turbo or an aftermarket S300-style T3 turbo.
Why Upgrade From the Base Hardware Kit
The base hardware kit shipped with the MAN0170 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 a stock-style turbo 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 running a stock-style turbo, 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
- Ford Cummins (Fummins) swap builders — F250, F350, Excursion, and other Ford trucks with 12V Cummins conversions
- Chevy Cummins (Chummins) swap builders — Silverado 2500HD, 3500HD, and other GM trucks with 12V Cummins swaps
- RV and motorhome owners running the 5.9L 12-valve Cummins
- School bus and commercial bus operators with 12V Cummins applications
- Industrial and marine applications requiring a low-rear T3 turbo position
- Builders running stock-style turbos or aftermarket S300-style T3 turbos
- 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 stock-style 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 stock 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 Fummins / Chummins / RV T3 Manifold (MAN0170) — 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
- One kit covers stock and aftermarket turbo configurations
Fitment
- 1988–1998 5.9L 12-Valve Cummins (B5.9 12V) in non-Dodge applications
- Pairs with the Diesel Power Source® T3 Manifold for 12V Fummins, Chummins, RV & Bus (MAN0170)
- Ford Cummins (Fummins) conversions — F250, F350, Excursion
- Chevy Cummins (Chummins) conversions — Silverado 2500HD, 3500HD
- RV, motorhome, school bus, commercial bus, industrial, and marine 12V Cummins applications
- Compatible with stock-style turbos and aftermarket S300-style T3 turbos
- Works with both divided and non-divided T3 turbo housings
Note: This kit fits the DPS Fummins/Chummins/RV manifold (MAN0170), which positions the turbo low and rear to clear heater cores on Ford and Chevy swaps. If your 12V Cummins is in a Dodge Ram truck, see the standard 12V Cummins T3 Manifold Hardware Kit linked below — that manifold uses the factory Dodge turbo position.
Pairs With This Kit
Frequently Asked Questions
No — this kit is specifically built for the DPS Fummins/Chummins/RV manifold (MAN0170), which positions the turbo low and rear to clear heater cores on Ford and Chevy swaps. If your 12V Cummins is in a Dodge Ram truck, you need the standard 12V Cummins T3 Manifold Hardware Kit, which fits the Dodge-position MAN0127 manifold instead.
Yes. The kit fits any 1988–1998 5.9L 12-valve Cummins engine paired with the MAN0170 manifold, regardless of whether it's installed in a Ford or Chevy chassis. It also fits RV, motorhome, school bus, commercial bus, industrial, and marine applications using the same manifold.
Both. The kit includes both T3 gasket styles, so it fits either housing configuration.
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.
