DPS 2-Piece 3rd Gen Cummins Exhaust Manifold for 2003–2007 5.9L Dodge Cummins T3
CARB Exempt – Legal for Street Use in California
The DPS 2-piece exhaust manifold is the best exhaust manifold for Dodge Cummins 5.9 Diesel 2003–2007 common rail engines. Made from high nickel moly-bendum ductile iron, this manifold is built to handle extreme heat while improving performance, airflow, and reliability.
Why Choose Our 3rd Gen 5.9 Cummins Exhaust Manifold?
Unlike OEM manifolds that shrink and crack under heat stress, the DPS 2-piece design features expansion joints that allow the manifold to flex naturally—eliminating warping, cracking, and gasket failures. CFD-tested for optimal flow and pressure balance, our manifold improves turbo spool-up, exhaust efficiency, and rear-cylinder temperatures by up to 200°F.
Top Features & Benefits:
- Flows 23% more than stock 5.9L Cummins manifold
- Reduces EGTs on rear cylinders by up to 200°F
- CFD-tested and balanced to maintain exhaust velocity
- Black high-temp coating for durability
- Drilled and tapped for pyrometer and pressure fittings
- Includes block gaskets and two bolts for installation
- Ships pre-assembled and pressure tested
- Replaces OEM part numbers 5135788AB and 5135788AC
- CARB exempt and legal in California
Better Than Stainless Steel Manifolds
Single-piece stainless manifolds expand up to twice as much as our ductile iron design, stressing gaskets, bolts, and even the engine head. Our manifold stays tight, aligned, and built to last.
Fitment Details:
- Fits Dodge Ram 5.9L Cummins trucks from 2003, 2004, 2005, 2006, and 2007
- Designed for T3 turbo flange setups
- Perfect upgrade or direct OEM replacement
Trusted Performance, CARB Legal
Diesel Power Source manifolds are CARB exempt and 100% legal for installation and street use in California. Ideal for emissions-compliant builds or performance upgrades in all 50 states.
For the best performance exhaust manifold for the 5.9L Cummins, trust Diesel Power Source. Quicker spool-up, lower EGTs, better fitment—and unmatched durability.
Learn more about DPS compound turbo kits for 3rd gen Cummins
Pair it with our performance turbo for 5.9 Cummins
