Diesel Power Source® Cummins 12-Valve Exhaust Manifold Complete Hardware & Gasket Upgrade Kit. 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 SKU 3216: Diesel Power Source® T3 Exhaust Manifold for 1989-1998 Cummins® 12-Valve for GM® Conversions, 3 piece. The base kit included with the manifold ships with standard flange bolts and the line relocation bracket. 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.
Why Upgrade From the Base Hardware Kit
The base hardware kit shipped with the DPS T3 12V 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 1989–1998 Dodge Ram 2500 and 3500 trucks running the 5.9L 12-Valve Cummins (B5.9 12V)
- First-gen and second-gen Cummins builders installing the DPS T3 12V Exhaust Manifold
- Off-road, marine, agricultural, and industrial 12V B5.9 builds running a T3-flange turbocharger
- Builders who want all install hardware and gaskets in a single purchase
