AEM Brute Force HD Intake System

01 - 4.5 6.6L Chevrolet Silverado | GMC Sierra

by AEM
SKU NWD-21-9021DC

21-9021DC | 21-9021DP

  • Increased horsepower
  • Tuned and dyno-tested to improve acceleration and engine sound
  • Low restriction aluminum tubing
  • Easy to install using commonly available tools
  • Air filter lasts up to 100,000 miles before cleaning is required (depending on driving conditions)
  • Washable and reusable oil-free filter media
  • AEM Lifetime Limited Warranty
  • Features
  • Videos
  • Instructions
  • Vehicle Fitment

The AEM 21-9021DP Brute Force HD Diesel Air Intake System produces horsepower and torque gains for diesel engines by replacing the vehicle’s restrictive factory air filter and air intake housing. This air intake system was designed, tuned and dyno-tested to fit specific GMC Sierra 2500 HD, 3500 and Chevrolet Silverado 2500 HD, 3500 models.

Air enters the system through an extra-large AEM Dryflow synthetic washable air filter for outstanding air flow, filtration and performance. The air filter is located in the original air box space and is protected by a heat shield which is designed to reduce intake air temperature and increase horsepower. The intake tubing is constructed from mandrel-bent aluminum featuring a durable chrome-like finish.

This air intake system was developed to accommodate the engine’s factory emissions control devices including the mass air flow sensor and air filter restriction gauge. The oval 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).

The air intake system is easy to install with commonly available tools and it is backed by AEM's Lifetime Limited Warranty.


Replacement Filter: 21-2259DK

Air Filter Color: Red

Air Filter Material: Non-woven Synthetic

Air Filter Outlet Shape: Round

Clamps Included: 5

Clamp Material: Steel

Clamp Style: Regular

Couplers Included: None

Product Style: AEM Brute Force HD Intake

Air Filter Height: 9 in (229 mm)

Intake Pipe Color / Finish: Gunmetal Grey or Polished

Intake Pipe Material: Aluminum

CARB EO Number: D-670-15

Street Legal In All US States: Yes

TUV Approved (Europe): No

Weight: 12.6 lb (5.7 kg)

Product Box Height: 14.94 in (379 mm)

Product Box Length: 22.2 in (564 mm)

Product Box Width: 14.5 in (368 mm)

Mounting Hardware Included: Yes



CHEVROLET Silverado 2500 HD

CHEVROLET Silverado 3500

V8-6.6L DSL LB7


GMC Sierra 2500 HD

GMC Sierra 3500

V8-6.6L DSL LB7


CHEVROLET Silverado 2500 HD

CHEVROLET Silverado 3500

V8-6.6L DSL


Sierra 2500 HD

Sierra 3500

V8-6.6L DSL