Best Cold Air Intakes for 2020-2024 Silverado 2500 HD

A cold air intake is the first bolt-on most 2020–2024 Silverado and Sierra 2500/3500 HD owners reach for, and for good reason: the factory airbox on these heavy-duty trucks is built for quiet, not airflow. Whether you run the 445 hp / 910 lb-ft 6.6L L5P Duramax (470 hp / 975 lb-ft on the refreshed 2024 engine) or the 401 hp / 464 lb-ft 6.6L L8T gas V8, a high-flow intake frees up airflow, sharpens throttle response, and — just as important on a truck that lives in snow, salt, and jobsite dust — upgrades the air filter to a washable, reusable element you will never replace again. Below we compare the five intakes we sell most for the T1-generation HD trucks, with real part numbers, prices, and fitment so you order the right kit for your engine the first time.

Why add a cold air intake to a 2500/3500 HD?

A cold air intake is a larger, less restrictive replacement for the factory airbox and filter that lets your engine breathe more freely. On the heavy-duty GM trucks the payoff is three-fold. First, airflow: the aftermarket tubes and filters flow far more air than the stock paper element, which matters most when you are towing heavy or when a tuner has already raised the power. Second, filtration and maintenance: these intakes use a washable cotton-gauze or synthetic filter rated to last the life of the truck, so instead of buying a paper filter every service you clean and re-oil one filter — a real advantage for a work truck that eats dust and road grime. Third, sound: on the Duramax especially, a high-flow intake lets more of that turbo spool and whistle into the cabin.

Be realistic about the numbers. On a stock L5P Duramax, manufacturers advertise modest gains — aFe cites up to +16 horsepower and +44 lb-ft of torque on its Momentum HD kit, and K&N estimates roughly +18 horsepower from the 63-3119. The intake's bigger job is removing an airflow restriction so the engine (and any future tune) is not choked on the inlet side. One honesty note up front: the diesel kits below are performance parts and are not CARB-approved for sale in California. If you register a truck in California, choose a 50-state-legal option and confirm the EO status before ordering.

2020–2024 HD cold air intakes compared

Here are the five kits we stock for the T1 2500/3500 HD, split by engine. Confirm your engine (6.6L L5P Duramax diesel or 6.6L L8T gas V8) before you buy — the diesel and gas intakes are not interchangeable.

Best overall for the Duramax: K&N 63-3119 AirCharger

The K&N 63-3119 is the best cold air intake for most 2020–2024 Duramax owners because it pairs a fully enclosed, heat-shielded airbox with K&N's washable oiled-cotton filter at the lowest price of our diesel picks. The sealed box is the key detail: an open filter sitting in a hot engine bay draws warm, less-dense air, while the 63-3119's roto-molded tube and closed box keep the filter fed with cooler air from outside the bay. It installs in about 90 minutes with hand tools and no cutting.

Best for towing & big filtration: aFe Momentum HD Pro 10R

The aFe Momentum HD Pro 10R is the pick for heavy-tow and dusty-jobsite Duramax trucks that want the largest possible filter. It centers on a massive 9-inch-tall, 360-degree radial-flow Pro 10R filter — ten layers of oiled cotton gauze — inside a sealed one-piece housing, and aFe measures it at 710 CFM at 7 inches of water. aFe advertises up to +16 horsepower and +44 lb-ft of torque on the L5P. The huge media area means longer intervals between cleanings, which is exactly what a work truck wants.

Best for built & tuned trucks: Wehrli 4in High-Flow Intake

The Wehrli 4-inch High-Flow Intake Bundle is the choice for tuned and built L5P Duramax trucks that have outgrown a standard kit. Where the K&N and aFe kits keep a factory-style tube diameter, Wehrli steps up to a mandrel-formed 4-inch aluminum intake tube with a large oiled filter, built for engines making well above stock power. It also comes in several powder-coat colors to match an engine-bay build. At $678 it is the premium option here, and it is aimed squarely at owners who already run a tune and bigger turbo plans rather than a bone-stock daily.

Running the 6.6L L8T gas V8? Two picks

If your HD came with the 401 hp / 464 lb-ft 6.6L L8T gas V8 instead of the Duramax, you need a gas-specific intake — the diesel kits above will not fit. Both of our gas picks use a sealed or heat-shielded box with a washable oiled filter, the same formula that makes the diesel kits work. Always confirm your exact model year against the listing before you order; the gas intakes carry a narrower validated year range than the diesel kits.

How to choose the right HD intake

Start with your engine, then your use case. The single most important step is matching the kit to the 6.6L L5P Duramax diesel or the 6.6L L8T gas V8 — they share displacement but nothing in the airbox. After that, three questions sort the picks:

• Oiled or dry filter? Oiled cotton (K&N, aFe Pro 10R, Wehrli) flows well and cleans up, but over-oiling can contaminate the MAF sensor. If you would rather not fuss with oil, aFe offers a dry Pro DRY S version of the HD kit (50-70056D).
• How hard do you work the truck? For heavy towing and dusty jobsites, the aFe Pro 10R's giant 9-inch filter means the longest intervals between cleanings. For a daily that mostly sees snow and salt, the sealed K&N box is plenty.
• Stock or tuned? A bone-stock or lightly tuned truck is well served by the K&N or aFe. If you are already running a tune and planning more power, the Wehrli 4-inch tube gives the most inlet headroom.

One more time on compliance: the diesel kits here are not CARB-approved and cannot be sold into California. Everywhere else, they install in about an hour to ninety minutes with hand tools. Not sure which fits your exact trim? Our Tampa, FL team can confirm fitment before you order — and you can browse the rest of our cold air intakes while you decide.