Diesel Power Source

T3 Manifold for 24v Cummins 1998.5-2002

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DPS 3 Piece 24V Cummins Exhaust Manifold for 5.9 Cummins Exhaust Manifold T3 Flange Years 1998.5 1999 2000 2001 2002 2nd Gen ** Legal for installation and street use in California, California E.O. Exe…
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DPS 3 Piece 24V Cummins Exhaust Manifold for 5.9 Cummins Exhaust Manifold

T3 Flange

Years 1998.5 1999 2000 2001 2002 2nd Gen

** Legal for installation and street use in California, California E.O. Exemption**

The 2nd Gen Cummins stock flange is T3.


24v Cummins 3 Piece Manifold Features:

  • Flows 23% more than the stock manifold.
  • Flow tested and balanced for smooth, balanced exhaust flow, while maintaining velocity for increased turbo spool up
  • Includes 6 gaskets, and 2 new bolts 
  • Expansion joints prevent cracking.
  • Three, Drilled and Tapped ports, for pyrometer and pressure fitting, one even in the bottom.
  • Made from nickel laced ductile iron
  • Black High Temperature Coating
  • 3-Piece design w/expansion joints
  • Comes pressed together ready to install
  • High performance factory replacement manifold for 24 valve Cummins.
  • Direct factory replacmenet of Cummins part number 5014170 AC, 3937187.

OEM Replacement Numbers

  • 5014170AC
  • 5014170AD
  • 5014170AA
  • 5014170AB
  • 3937187


The DPS 3 piece exhaust manifold, is a new design for just the 24 Cummins manifolds.  This is an important factor, because nearly every other competitor manifold on the market uses the same mold design for the 24v Cummins Manifold (round port), as for the 12 valve (rectangular port) manifolds and then they machine the ports to the correct shape.  This is good for production cost, but poor for exhaust flow and performance, because the competitors mold design is smaller and then machined to shape, leaving smaller ports and poor exhaust transition, compared to our new design.  Our 24V Cummins exhaust manifold round port manifold a separate mold.  More costly to make?  Yes.  Better performance for you?  Absolutely!  Still the best price manifold on the market, why even consider anything else?

The Diesel Power Source 3-Piece 24 valve Cummins manifold for the Dodge Cummins engine is both a great performance manifold and a factory Cummins replacement manifold. This 3-Piece Manifold is cast from Ductile Iron similar to your turbine housing (which can handle extreme heat, without much expansion or shrinkage).  We've designed this manifold with CFD testing to increase turbo spool-up, and increase exhaust gas efficiency, all while maintaining exhaust gas velocity, so the turbo will function optimally. We've made our Cummins exhaust manifold the end ports flow more similar to the center ports so the end ports EGT's won't be severly hotter than the center ports.

Some competitors 24 Valve Cummins Exhaust Manifold boast "Huge runners, or Huge tube design", while this sounds appealing, too big of runners will actually slow the exhaust velocity, and then need to re-accelerate as it bottle necks through the turbo, causing a loss in horsepower, and spool-up.  We have actually seen a competitors manifold decrease horsepower by 40 hp on a 400 hp truck, where our manifold will typically cause a 10-18HP gain.

Stock manifolds and one-piece competitor manifolds are known to shrink significantly, causing manifold-cracking, gasket problems, and exhaust flow problems created by exhaust port misalignment. Even stainless steel manifolds will shrink significantly, causing misalignment.  The dirty little secret is that competitors stainless steel actually moves (expands and contracts) more than ductile iron does.  Our 3-Piece Manifold, on the other hand, allows manifold to expand and contract with heat, eliminating warping and cracking to the manifold, eliminating the dreaded manifold shrinkage.


**All DPS 5.9 Cummins Exhaust Manifolds for 24 valve Cummins have been granted an exemption by CARB, which means they are legal to be installed and used in the state of California.


**Free shipping to the lower 48 states.  When shipping to anywhere outside of the lower 48 states, additional shipping fees may apply.

Other Tags:

  • 1999 Cummins Manifold
  • 2001 Cummins Manifold
  • 2001 Cummins exhaust manifold
  • 2001 Dodge Cummins exhaust manifold


  • Exhaust Manifold 2nd Gen Ram Cummins 5

    Posted by Greg Swartz on May 21, 2024

    Fitment is great, overall install was easy except getting at the middle bottom bolts. Glad I read other reviews to get the turbo gasket. Have done the test run yet but does sound so much better.

  • Love 5

    Posted by Xavier on Jan 14, 2024

    this manifold is bad a$$ very solid and way better flow best price out there

  • T3 Manifold 5

    Posted by J R on Oct 22, 2023

    Item fit great, great quality, easy installation.

  • $$ 5

    Posted by Xter on Oct 19, 2022

    Best price around quantity perfect quick shipping will be doing more business

  • Fit Perfect! 5

    Posted by Anders M on Aug 19, 2021

    Great quality I recommend getting studs as well

  • Nice 4

    Posted by Luke G on May 31, 2021

    Really nice manifold for the money. Instead with no alignment issues or leaks. While installing I went ahead and added head studs which give it a cleaner look and easier to mount. Thanks.

  • Looks good! 5

    Posted by 5.9Power on Jun 8, 2019

    Bolted up nice, you do have to modify your coolant line but was easy . Fast shipping.

T3 Manifold for 24v Cummins 1998.5-2002

T3 Manifold for 24v Cummins 1998.5-2002


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