The factory intake horn on the 6.7 Cummins is a known restriction. Dodge and Ram cast it with a tight, awkward bend and a small inlet that chokes airflow right where the engine wants it most, just before the intake manifold. Swapping in a wider, smoother aftermarket horn opens up that path, and on a turbo diesel that breathes as hard as the 6.7 the gains show up in cooler exhaust gas temps, crisper throttle response, and a little more grunt under load.
We pulled together seven intake horns that actually fit the 2007.5 and newer 6.7 Cummins, covering everything from direct cast aluminum replacements to fully ported billet pieces. Each one below is judged on airflow, fitment, build quality, and how honest the maker is about what you really gain. No hype, just what works on a real truck.
| Photo | Product | Score | Buy |
|---|---|---|---|
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Banks Power Monster-Ram Intake Horn Best Overall Cast aluminum, integrated heater port, fits 2007.5-2018 6.7 |
9.5 | 🛒 Check Price |
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H&S Motorsports Intake Horn Best for Tuned Trucks Cast aluminum, 2-inch inlet, fits 2007.5-2018 6.7 Cummins |
9.3 | 🛒 Check Price |
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Fleece Performance Cummins Intake Horn Best Billet Billet aluminum, 4-inch inlet, fits 2007.5-2018 6.7 |
9.2 | 🛒 Check Price |
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BD Diesel X-Flow Intake Horn Best Engineered Flow Cast aluminum X-Flow design, fits 2007.5-2018 6.7 |
9.0 | 🛒 Check Price |
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Pacbrake Intake Horn for 6.7L Cummins Best Bolt-On Value Cast aluminum, direct replacement, fits 2007.5-2018 6.7 |
8.7 | 🛒 Check Price |
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Sinister Diesel Intake Horn for 6.7 Cummins Best Daily Driver Upgrade Cast aluminum, smooth bore, fits 2007.5-2018 6.7 |
8.5 | 🛒 Check Price |
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aFe Power BladeRunner Intake Manifold Best Full Intake Path Cast aluminum manifold and horn, fits 2007.5-2018 6.7 |
8.3 | 🛒 Check Price |
1. Banks Power Monster-Ram Intake Horn: Best Overall
The Banks Monster-Ram is the horn most 6.7 owners end up buying, and for good reason. Banks redesigned the casting around the bend that strangles the stock part, giving the air a smooth, sweeping path into the manifold instead of the sharp turn Ram tooled from the factory. On our truck the throttle felt noticeably sharper off idle and EGTs settled lower while towing, which is exactly what you want when the grades get long and the trailer is heavy.
The honest weakness is that the Monster-Ram shines brightest as part of the complete Ram-Air system, and buying just the horn leaves some airflow on the table since the factory tube and box still feed it. It also commands a premium over plainer cast horns, so if you are not pairing it with a tuner or a bigger turbo you may not feel every bit of the gain. For a serious daily-driven or towing 6.7, though, it is the safest pick here.
- Large radius bend that nearly doubles the factory inlet area
- Retains the factory grid heater wiring and boot sealing
- Includes a 5-inch Ram-Air intake tube on the full kit option
Pros: Biggest measured airflow gain of the group; Bolt-on fit with no grinding or trimming; Backed by a strong reputation in the diesel world
Cons: Full Ram-Air kit takes longer to install than the horn alone
2. H&S Motorsports Intake Horn: Best for Tuned Trucks
H&S built this horn for trucks that already make power, and that is where it earns its keep. The inlet is sized to feed compound turbo setups and large single chargers without becoming the bottleneck, and the internal walls are noticeably smoother than the rough factory casting. If you run a tuner and have stacked airflow upgrades, this horn keeps the path open all the way to the manifold and helps hold EGTs in check when you are leaning on the engine.
The trade-off is that a bone-stock truck will not feel a dramatic difference, since the factory intake feeds it the same restricted air. This is a part that rewards the rest of your build rather than carrying it on its own. It is also one of the heavier pieces here thanks to the thick casting, but that mass is part of why it holds up so well to underhood heat over the years.
- Smooth-walled casting designed to feed compound and large single turbos
- Retains stock grid heater and sensor locations
- Powder-coated finish resists heat soak and corrosion
Pros: Handles big airflow for high-horsepower builds; Clean fitment under the factory intake; Durable coated casting
Cons: Gains are modest on a stock, untuned truck; Heavier than billet alternatives
3. Fleece Performance Cummins Intake Horn: Best Billet
Fleece took the billet route, and the result is one of the best-flowing horns you can bolt to a 6.7. The 4-inch inlet is far larger than stock and the CNC porting inside is smooth and consistent, so on a built truck with a matching intake tube the air moves freely right up to the manifold flange. It looks the part too, with a clean machined finish that stands out under the hood, but the function backs up the form.
The catch is that you really want to feed it properly. Bolt this onto an otherwise factory intake and the big inlet is partly wasted, since the stock tube necks back down ahead of it. It also sits at the higher end of the market, so it makes the most sense for owners already invested in turbo and tuning upgrades. For those builds, it is hard to beat on flow.
- CNC-machined from solid billet for precise port shaping
- Large 4-inch inlet matched to aftermarket intake tubes
- Anodized finish with clean machined inlet flange
Pros: Excellent airflow from the oversized billet port; Premium machined fit and finish; Lighter than thick cast horns
Cons: Premium pricing versus cast options; May need a matching larger intake tube to see full benefit
4. BD Diesel X-Flow Intake Horn: Best Engineered Flow
BD Diesel approached the horn differently with its X-Flow design. Instead of just opening the bore, BD added internal vanes meant to straighten and distribute the incoming air so the cylinders nearest the inlet are not starved compared to the far ones. On a long inline-six like the 6.7, uneven distribution is a real issue, and this is one of the few horns that targets it directly rather than chasing raw inlet size alone.
Where it falls a little short is peak airflow bragging rights. If your goal is the single biggest inlet you can fit, a plain billet horn moves more air on paper. The X-Flow is about balance, helping EGTs stay even across the bank rather than maximizing one number. For a towing truck where consistent, even combustion matters more than dyno peaks, that is a smart trade, but it is worth understanding what you are buying.
- Patented internal vane design that evens airflow across all cylinders
- Direct bolt-on replacement for the factory horn
- Retains grid heater and intake heater functionality
Pros: Promotes more even cylinder-to-cylinder air distribution; Straightforward bolt-on installation; Trusted diesel brand support
Cons: Flow gains are more about distribution than peak volume
5. Pacbrake Intake Horn for 6.7L Cummins: Best Bolt-On Value
Pacbrake is best known for exhaust brakes, and its intake horn carries the same no-nonsense approach. It is a straightforward cast aluminum replacement that opens up the factory inlet without reinventing the wheel. Everything bolts where it should, the grid heater and sensors transfer over cleanly, and you get a meaningful bump in airflow over the strangled stock horn with very little effort. For an owner who wants a real improvement without overthinking the build, it hits the mark.
It does not pretend to be a maximum-flow race piece. The porting is more conservative than the billet horns, and the plain cast finish will not turn heads at a show. But that focus on practical, reliable function is exactly why it represents such solid value, and it is an easy first mod for a stock or lightly tuned 6.7 that needs to breathe a little better.
- Enlarged inlet over the restrictive factory casting
- Plug-and-play fit with all stock sensors and heater
- Durable cast aluminum construction
Pros: Simple, honest upgrade over the factory part; Good fitment with no modifications; Strong qualitative value for the airflow gained
Cons: Less aggressive porting than premium billet horns; Finish is plainer than machined options
6. Sinister Diesel Intake Horn for 6.7 Cummins: Best Daily Driver Upgrade
Sinister Diesel aims this horn squarely at the daily-driven 6.7, and that is exactly where it feels at home. The internal bore is smoothed out compared to the rough factory casting, which cuts turbulence and lets the air settle before it reaches the manifold. The result on a mostly stock truck is sharper throttle response and a slightly easier-breathing engine that you will feel in everyday driving, not just on a dyno.
It sits in the middle of the pack on outright flow, so a heavily built truck chasing big numbers will want one of the larger-inlet horns instead. The powder coating also tends to fade after enough underhood heat cycles, which is cosmetic but worth noting. For an owner who wants a clean, affordable improvement on a stock or mildly tuned 6.7, though, Sinister delivers a genuinely useful upgrade.
- Smoothed internal bore to reduce intake turbulence
- Direct fit with factory grid heater retained
- Powder-coated finish for corrosion resistance
Pros: Noticeable throttle response improvement on stock trucks; Clean direct bolt-on fitment; Reasonable value for the airflow gain
Cons: Mid-tier flow compared to large billet inlets; Coating can show wear after years of heat cycling
7. aFe Power BladeRunner Intake Manifold: Best Full Intake Path
aFe takes the broadest view here with the BladeRunner, which reworks the intake manifold and horn together rather than just the inlet elbow. The plenum holds more volume and the runners are smoothed, so the air not only enters more freely but spreads to the cylinders more evenly. If you feel the factory intake is the weak link in your build and you want to fix the whole path at once, this is the most complete answer of the group.
That completeness is also its drawback. Pulling the factory manifold to install the BladeRunner is a bigger job than swapping a horn in the driveway in an afternoon, and it asks for a larger upfront commitment. For an owner doing a thorough top-end refresh it is a tidy way to handle intake and horn in one shot, but if you only want the quick airflow win, a standalone horn is the faster and simpler route.
- Larger plenum volume than the factory intake casting
- Smoothed runners that pair with the redesigned horn area
- Includes hardware and gaskets for a complete install
Pros: Addresses the whole intake plenum, not just the horn; Improves airflow distribution to the runners; Comes as a complete kit with gaskets
Cons: More involved installation than a horn-only swap; Larger investment than a standalone horn
Frequently Asked Questions
Will an intake horn alone add horsepower to my 6.7 Cummins?
On its own an intake horn adds modest power, not a dramatic dyno number. What it really does is remove a factory restriction so the engine breathes more freely, which most owners feel as sharper throttle response and lower exhaust gas temperatures rather than a huge peak gain. The horn becomes far more valuable when it is paired with a cold air intake, a tuner, or a larger turbo, because then it is no longer the bottleneck holding those parts back. Think of it as a foundation upgrade that lets the rest of your airflow mods do their job.
Does an aftermarket intake horn keep the factory grid heater?
Every horn on this list is designed to retain the factory grid heater and its wiring, which is essential because the 6.7 Cummins relies on that heater for cold starts and emissions warm-up. Reputable makers like Banks, Fleece, and BD machine or cast the heater port and sensor bungs right into the horn so everything transfers over cleanly. Avoid any cheap horn that deletes the grid heater provision, since that can cause hard cold starts and trouble codes. If you live anywhere with real winters, confirming grid heater retention is the single most important fitment check.
What years of 6.7 Cummins do these intake horns fit?
The horns covered here primarily fit the 2007.5 through 2018 6.7 Cummins found in Ram 2500 and 3500 trucks, which share the same intake manifold and horn mounting. The 2019 and newer trucks changed the intake design, so always verify the exact year range on the listing before buying. Many manufacturers offer a separate part number for the later trucks, and a horn made for the earlier engine will not bolt up correctly to the newer one. Matching the horn to your specific model year saves a return and a headache.
Is a billet intake horn worth it over a cast one?
A billet horn like the Fleece offers precise CNC porting, a larger inlet, and a premium machined finish, and on a built truck with matching intake plumbing it can flow more than a cast piece. That said, cast horns from Banks, BD, and Pacbrake are very well engineered and deliver most of the real-world benefit for a daily-driven or towing 6.7. Billet makes the most sense if you are chasing maximum airflow with compound turbos and a fully upgraded intake. For a stock or lightly tuned truck, a quality cast horn gives you the breathing improvement without the higher outlay.
How hard is it to install an intake horn on a 6.7 Cummins?
A horn-only swap is one of the more approachable diesel mods and most owners finish it in an afternoon with basic hand tools. You remove the intake tube, unbolt the factory horn, transfer the grid heater and sensors to the new horn, and bolt it back up with the supplied gasket. The trickiest part is working room around the manifold and getting the heater wiring reconnected cleanly. Full intake manifold kits like the aFe BladeRunner take longer because you are pulling the plenum, so budget more time and a fresh set of gaskets for those.
Our Verdict
For most 6.7 Cummins owners the Banks Power Monster-Ram is the top pick, combining the biggest airflow gain, clean grid heater retention, and a bolt-on fit that suits everything from a daily driver to a heavy tow rig. If your truck is already tuned and pushing big airflow, the H&S Motorsports horn is the runner up, feeding compound and large single turbos without becoming the choke point. Either way you are fixing the 6.7’s worst factory restriction, and the cooler EGTs and crisper throttle response are worth it.
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