6.7 Cummins Intake Manifold & Upgrades

Why Does Your 6.7 Cummins Need an Intake Upgrade?

The Factory Horn and Grid Heater Strangle Airflow

The stock intake path on a 6.7L Cummins funnels charge air through a narrow cast elbow and straight into the grid heater plate before it ever reaches the manifold. That assembly was engineered for manufacturing cost, not flow, and independent bench testing puts proper 3.5-inch high flow designs at roughly 49 percent more airflow than the factory elbow. Every pound of boost your turbo makes gets taxed passing through that restriction.

Uneven Charge Distribution Cooks the Rear Cylinders

The factory manifold does not feed all six cylinders equally; the front runners get the cool, dense charge while the rear cylinders run lean and hot. That imbalance is why EGT probes mounted downstream read scary numbers on stock trucks towing heavy, with sustained climbs pushing past 1200 degrees. A properly designed plenum evens out cylinder-to-cylinder distribution so the whole engine breathes the same air.

Heat Cycles Fatigue Stock Boots and Clamps

Fabric intercooler boots and worm-gear clamps harden, crack, and weep boost after a few years of regen heat cycles. A truck that leaks 3 pounds of boost works its turbo harder to make the same manifold pressure, runs hotter, and surges under load. Aged seals and stretched clamps are the slow leak that robs power one heat cycle at a time.

What Can an Intake Upgrade Solve?

High Flow Manifolds Even Out the Charge

Our 3.5-inch high flow intake manifold elbows and full manifold kits replace the restrictive factory castings with mandrel-bent tubing, CNC-machined 6061-T6 billet aluminum flanges, and precision TIG welds throughout. Larger plenum volume plus smooth radius transitions feed all six cylinders evenly, which drops EGTs under load, recovers turbo spool, and sharpens throttle response whether you are towing or empty.

Grid Heater Upgrades Cut Restriction and Keep Cold Starts

The grid heater plate sits mid-stream as a brick wall in the intake path. Our billet plenum plates and grid heater upgrade kits open up that cross-section for free-flowing air while retaining the heater element function for cold-weather starts, so trucks in real winter climates keep their cold-start aid instead of deleting it. Coverage runs from the 2007.5 trucks straight through the 2019-2024 Rams.

Intercooler Pipes and Boots Seal the Boost Circuit

Mandrel-bent intercooler pipe sets replace the accordioned factory plumbing with straight, smooth-radius tubes sealed by 5-ply silicone couplers and constant-tension T-bolt clamps. Combined with our high-temperature gasket kits, the entire charge path from intercooler to intake horn holds rated boost without leaking, so the turbo stops working overtime to compensate.

Shop 6.7 Cummins Intake by Dodge Ram Engine & Fitment Guide

• Intercooler Pipe Boot Clamp Kit (2007-2009) - Fits the 6.7L Cummins in Dodge Ram 2500/3500 (2007-2009). 3rd Gen specific boost plumbing refresh with silicone boots and T-bolt clamps sized to the early charge pipes.
• High Flow Intake Manifold Elbow Tube Horn 3.5" (2007.5-2018) - Fits the 6.7L Cummins in Dodge Ram 2500/3500 (2007.5-2018). Broad-coverage 3.5-inch mandrel-bent elbow with billet flanges that replaces the choked factory horn across 3rd Gen and 4th Gen trucks, from a 2008 Ram 2500 to a 2017 Ram 3500.
• 3.5" Intake Manifold Elbow + EGR Cooler Delete Kit (2010-2014) - Fits the 6.7L Cummins in Dodge Ram 2500/3500 (2010-2014). Early 4th Gen combo that pairs the high flow elbow with EGR cooler delete hardware; requires delete-capable tuning and is for off-road use.
• Intake Manifold Kit (2013-2018) - Fits the 6.7L Cummins in Dodge Ram 2500/3500 (2013-2018). Late 4th Gen full manifold replacement with enlarged plenum volume and even runner distribution for trucks towing heavy, including 2014, 2015, and 2018 Ram 2500 and 3500 models.
• For 2013-2018 Intercooler Pipe - Fits the 6.7L Cummins in Dodge Ram 2500/3500 (2013-2018). Mandrel-bent charge pipe upgrade that removes the restrictive factory bends on late 4th Gen trucks.
• Grid Heater Upgrade Kit (2007.5-2024 and 2011-2024 variants) - Fits the 6.7L Cummins in Ram 2500/3500 across all generations through the current trucks. Opens the intake cross-section while keeping cold-start grid function.
• Air Intake Resonator Lower Hose Tube Duct (2007-2018) - Fits the 6.7L Cummins in Dodge Ram 2500/3500 (2007-2018). Direct replacement lower intake duct for cracked or oil-soaked factory pieces.
• Air Manifold Cover Gasket Kit (2008-2024) - Fits the 6.7L Cummins in Dodge Ram 2500/3500 (2008-2024). Fresh high-temperature gaskets for any manifold or grid heater service, because reusing baked seals is how boost leaks start.

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The industry standard for high-performance diesel reliability.

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Related 6.7 Cummins Collections

Round out the rest of your 6.7 Cummins build:

• 6.7 Cummins reliability upgrades - The full 6.7 Cummins performance parts catalog for reliability and power builds.

FAQs About 6.7 Cummins Intake Manifold & Upgrades

What does an intake manifold upgrade do for a 6.7 Cummins?

The factory intake elbow and manifold were cast to a budget, with a narrow cross-section and sharp transitions that choke airflow into the head. A high flow manifold opens the plenum volume, smooths the radius from the intercooler tube to the intake ports, and feeds all six cylinders a more even charge. Owners see quicker turbo spool, sharper throttle response, and lower EGTs under load, with independent flow bench testing showing roughly 49 percent more airflow from proper 3.5-inch designs.

Is a cold air intake worth it on a 6.7 Cummins?

On a stock or lightly tuned truck, honest answer: not really. The factory airbox already outflows the stock turbo and filters better than most oiled cone filters, with forum consensus that it supports roughly 500 horsepower before it becomes the limiting factor.

The real bottleneck sits downstream of the filter, in the cast intake horn, the grid heater plate, and the manifold, and that is exactly what this collection fixes. Once you are running a bigger turbo and pushing serious air, a sealed cold air intake plus our high flow manifold work together as a matched pair.

What is the best intake upgrade for a 6.7 Cummins?

Match the part to your generation and how you use the truck. On 2013-2018 Rams the full intake manifold kit is the strongest single upgrade because it replaces the most restrictive casting on the engine. On 2007.5-2012 trucks the 3.5-inch high flow elbow horn delivers most of the benefit at a lower price point.

From there, layer on a grid heater upgrade to clear the mid-stream restriction and intercooler pipes with fresh boots to seal the boost circuit. Trucks that tow heavy benefit most from the full combination, while a daily driver can stop at the manifold or horn and still feel the difference.

Will an intake manifold lower EGTs on my 6.7 Cummins?

Yes, under load is where it shows. Stock trucks towing at gross combined weight regularly climb past 1200 degrees on sustained grades, and a lot of that comes from uneven cylinder distribution starving the rear runners. A high flow manifold feeds every cylinder the same charge, so combustion runs cooler and more complete.

For the biggest EGT drop, pair the manifold with a free-flowing exhaust and tuning. The manifold alone is a moderate improvement; the full combination is what pulls 100-plus degrees back on a long climb.

What is the difference between an intake horn and an intake manifold?

The intake horn, also called the intake elbow, is the casting that connects the intercooler tube to the manifold and is the first bottleneck in the factory system. The intake manifold is the plenum that bolts to the head and distributes charge air to all six intake ports.

On the 6.7 Cummins, the grid heater plate sits between them, adding its own restriction. Budget builds start with the horn, full builds on 2013-2018 trucks replace the manifold, and the complete answer addresses both plus the grid heater.

Should I upgrade or delete my 6.7 Cummins grid heater?

The grid heater exists to warm intake air for cold starts, but its plate sits square in the airflow path as a permanent restriction. Our grid heater upgrade kits open up that cross-section for better flow while retaining the heater function, so trucks in cold climates keep their cold-start aid.

Full grid heater delete plates maximize flow but leave you without the cold-start assist, which matters if your truck sees sub-freezing mornings. If you tow heavy in a mild climate, the upgrade route gives you nearly all the flow with none of the cold-start compromise.

Do I need a tune for a 6.7 Cummins intake manifold upgrade?

Straight airflow parts, including manifolds, horns, intercooler pipes, and boots, are bolt-on upgrades that need no tuning and throw no codes. Install, torque, and drive.

The exception is the combo kit pairing the 3.5-inch elbow with an EGR cooler delete, which requires delete-capable tuning since it alters the emissions system. Plenty of owners add tuning later to take full advantage of the increased airflow, but it is not required for the core intake pieces.

What years do these 6.7 Cummins intake parts fit?

This collection covers the 6.7L Cummins from its 2007.5 launch through the 2024 trucks. Third Gen 2007.5-2009 Rams use the boot and clamp kits plus the high flow horn, 2010-2012 trucks take the 3.5-inch elbow and the elbow with EGR delete combo, and 2013-2018 Rams get the full intake manifold kits and intercooler pipes.

Grid heater upgrade kits and gasket coverage run from 2008 straight through the 2019-2024 Rams, so a 2021 Ram 2500 is covered alongside a 2011 Ram 3500. Match parts to your build year rather than model year, since early production dates can straddle generation changeovers.

Can I install a 6.7 Cummins intake manifold myself?

Yes, this is a driveway job with basic hand tools. Pull the intercooler tube, unbolt the factory horn or manifold, swap in the new piece with fresh gaskets, and torque in stages following the supplied sequence.

Budget a couple of hours and always install new gaskets rather than reusing the baked factory seals, which is why we stock the gasket kit separately. If anything in the job gives you trouble, our 24/7 support line has techs who have done these installs hundreds of times.

Are 6.7 Cummins intake upgrades street legal?

Straight airflow parts, including manifolds, horns, intercooler pipes, boots, and gaskets do not touch emissions controls and are street-legal bolt-ons in most jurisdictions, though California restricts some aftermarket intake components. Combo kits that pair intake hardware with an EGR cooler delete are sold for competition and closed-course off-road use only, because they alter the emissions system.

Check the regulations for your state and how you use the truck before ordering a delete-style kit. Fitment is generation-specific across 2007.5-2009, 2010-2012, 2013-2018, and 2019-2024 Rams, so verify your build year or contact our 24/7 support, and we will confirm the correct part. Every order ships free from our US warehouses, carries a 1-year warranty, and is backed by a 45-day return policy if the fitment is not right.