3-Piece 24V Cummins Exhaust Manifold for 1998.5–2002 Dodge 5.9L | T3 Flange
Legal for Street Use in California – CARB Exempt
This DPS 3-piece exhaust manifold is a high-performance, factory-replacement manifold for 1998.5–2002 2nd Gen 24V 5.9L Cummins engines with a T3 flange. Engineered for improved durability, flow, and spool-up, it’s cast from nickel-laced ductile iron and features expansion joints to prevent cracking.
Key Features & Benefits:
- 23% more exhaust flow than stock manifold
- Flow-tested and balanced to optimize velocity and turbo spool
- Includes 6 gaskets and 2 new mounting bolts
- Expansion joints allow natural heat flex without cracking
- Three drilled and tapped ports for pyro and pressure sensors (including one on the bottom)
- Durable black high-temperature coating
- Ships pressed together and ready to install
- Direct replacement for Cummins OEM part numbers 5014170AC, 3937187, and others
Fitment:
Fits all 2nd Gen 24V Dodge Cummins trucks from 1998.5, 1999, 2000, 2001, and 2002.
OEM Replacement Numbers:
- 5014170AC
- 5014170AD
- 5014170AA
- 5014170AB
- 3937187
Better Mold Design = Better Flow
Unlike competitors who repurpose 12V rectangular port molds and machine them down for 24V round ports, we use a dedicated round-port mold designed specifically for 24V heads. This delivers better port shape, flow efficiency, and EGT balance.
Why Not Oversized Tubes?
Some manifolds advertise “huge runners,” but this slows exhaust velocity, bottlenecks at the turbo flange, and reduces performance. We’ve tested competitors’ designs that dropped horsepower by 40 HP. In contrast, our manifold typically adds 10–18 HP on a 400 HP truck.
Superior to Stainless & One-Piece Manifolds
Stock and stainless steel manifolds shrink under heat, causing cracks, misalignment, and gasket failure. Stainless steel expands up to twice as much as ductile iron. Our 3-piece manifold uses precision expansion joints to allow safe thermal movement without warping—solving the “manifold shrinkage” issue for good.
CFD-Engineered for Power & Spool-Up
Our manifold is CFD-designed to keep exhaust gas velocity high, improve turbo responsiveness, and equalize temps across cylinders. It's built like a turbine housing—strong, heat-resistant, and made for performance.
Note: This manifold is CARB exempt and fully legal for use in California.
**When upgrading to the Spin Lock Bolt or Multi-Layer Gasket Kit, please note that these are upgraded components. The standard bolts and gaskets will not be included with the upgrade option.
Looking to add a compound turbo? Pair it with our 24V Add-a-Turbo Kit.
