Exhaust Manifolds

2010-2018 Dodge Ram 2500 & 3500 6.7L Cummins Performance Exhaust Manifolds & Hardware

Eliminate performance-robbing soot leaks, prevent snapped cylinder head bolts, and maximize your turbocharger’s drive efficiency with premium 2010–2018 6.7L Cummins 4th Gen exhaust manifolds from Full Force Diesel. The long, heavy inline-six cylinder head on the 6.7L Cummins creates an incredible concentration of heat, particularly at the rear cylinders (numbers 5 and 6). While the factory cast-iron manifold is adequate for conservative stock workloads, it is highly prone to severe thermal distortion under sustained towing or performance conditions. Upgrading to an engineered aftermarket exhaust manifold guarantees the structural integrity required to support heavy EGT loads while significantly smoothing exhaust gas velocity before it hits your turbine wheel.

The Problem with Stock Cast Iron: Understanding "Manifold Shrink"

If you notice a loud ticking noise during cold starts or see black soot caked around your rear cylinder ports, your factory manifold has likely failed. Cast iron experiences severe molecular movement when cycling between ambient winter temperatures and 1,200+ degree towing environments:

• Thermal Contraction and Bowing: Over time, continuous extreme heat cycles cause the factory single-piece cast manifold to permanently shrink and warp. As the iron contracts, it pulls inward toward the center of the engine block.

• Snapped Mounting Studs: Because the cylinder head cannot move, the physical shrinkage of the manifold places immense shearing stress on the factory mounting hardware. This forces the bolts on cylinders 1 and 6 to snap off flush inside the cylinder head casting, creating an immediate exhaust leak that ruins your boost pressure and drives up your operating temperatures.

Engineered Solutions: Ductile Iron and Multi-Piece Designs

Our selection of premium aftermarket manifolds completely eliminates these structural design flaws through superior metallurgy and advanced geometric layouts:

• High-Ductile Silicon Iron Casting: Unlike standard brittle grey iron, premium aftermarket replacements are cast from high-silicon ductile iron. These upgraded units feature beefed-up internal runner walls and reinforced mounting flanges that expand and contract without warping, bowing, or cracking under extreme thermal pressure.

• Smooth-Bore Pulsed Flow Design: Factory manifolds feature sharp, blocky internal corners that create severe air turbulence and uneven exhaust gas scavenging. Performance upgrades utilize smooth, mandrel-smooth internal bores with matched-pulse paths. This streamlined layout directs exhaust pulses smoothly into the turbocharger flange, reducing turbo lag and boosting low-end torque.

• Essential Installation Hardware: When swapping out your manifold, always replace the mounting hardware. Upgrading to high-tensile strength stainless steel or chromoly stud kits ensures uniform clamping force. Additionally, using multi-layer stainless steel (MLS) gaskets prevents face-leaks and guarantees a permanent, airtight seal against the cylinder head ports.

At Full Force Diesel, we stock the heavy-duty, field-tested exhaust plumbing required to build a bulletproof common-rail setup. Explore our complete line of 2010–2018 6.7L Cummins performance exhaust manifolds, heavy-duty stud kits, multi-layer replacement gaskets, and specialized installation hardware above to fix your truck once and for all.