AEM 21-891C Cold Air Intake System

Compatible with most LT, LTZ, RST, SLT, Denali, All-Terrain, High Country, and similar trims.

(Does NOT fit 4.3L V6, and not for 2021+ refresh trucks with the updated intake layout.)

This Performance Air Intake System allows your engine to breathe more air compared to the restrictive factory air intake housing. It is designed, tuned and dyno-tested to produce more horsepower and torque.

Why Upgrade Your Truck with the AEM 21-891C?

Because your V8 deserves to inhale like one.

The AEM 21-891C gives you:

• Massively improved airflow over the restrictive OEM airbox

• Sharper throttle response, especially when towing or passing

• A deeper, more aggressive V8 induction growl

• Better high-RPM breathing for the 6.2L

• AEM Dryflow filter – washable, reusable, oil-free

• Mandrel-bent aluminum intake tube with a durable powder-coat finish

• Cooler, denser air thanks to its sealed cold-air routing design

Whether you’re towing, daily driving, or just trying to make your truck actually sound like a V8, this intake delivers.

Air enters the system through an oversized AEM Dryflow synthetic washable air filter for outstanding air flow, filtration and performance.

Key Features of the AEM 21-891C Cold Air Intake

🌀 Mandrel-Bent Aluminum Air Tube

Provides a smooth, unrestricted airflow path and stable MAF readings for both the 5.3 and 6.2 engines.

🧼 AEM Dryflow Synthetic Filter

The air intake tube is constructed from mandrel-bent aluminum featuring a durable gunmetal gray powder coated finish. A custom shaped heat shield with lid is included.

❄ Sealed Cold-Air Box

Pulls air from the factory cool-air duct, reducing heat-soak—especially important during towing or slow-speed off-road driving.

🔧 Direct, OEM-Quality Fitment

Uses factory mounting points, retains OEM sensors, and includes all hardware.
No cutting, drilling, or backyard fabrication.

🎧 Real V8 Sound

Expect more intake growl and deeper resonance under throttle—without being obnoxious on the highway.

The tapered cylinder shaped AEM Dryflow air filter is made from an oil-free, synthetic filter media that can be used for up to 100,000 miles before cleaning is needed (depending on driving conditions).

Performance Gains You Can Expect

On 5.3L & 6.2L trucks, owners typically report:

• Better throttle tip-in

• More mid-range torque feel

• Improved top-end airflow

• Enhanced towing responsiveness

• Stronger acceleration when passing

• A richer, throatier V8 intake note

With a tune, cat-back exhaust, or performance throttle body, the benefits increase dramatically.

This Air Intake System is backed by AEM’s Lifetime Limited Warranty.

Daily-Driver Approved

• Works on factory ECU (tune optional but beneficial)

• No oil on the filter = no ruined MAF sensors

• Keeps MPG stable (unless you treat every stoplight like a drag strip)

• No drone or weird cabin resonance

Perfect for work trucks, street trucks, and weekend warriors.

Some AEM air intakes are not legal for sale or use in California and other states adopting California emission standards, while others are 50 state legal. View the vehicle applications to determine the legal status for each vehicle.