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2011-2016 LML Duramax 4" Intake Kit with Air Box Stage 2

- 37% Improvement in Air Flow Over Stock Intake
- 5.6% Improvement in Air Flow Over Stock Intake Horn
- 4" Intake Pipe
- Air Box & Lid Constructed of 10G Aluminum Sheet
- Dry Air Filter
- Outerwear's Pre-Filter Cover
- Includes Installation Hardware
- Silicone Boot & Stainless Steel T-Bolt Clamps
- 14g Aluminum Construction
- Installs Easily with Basic Hand tools
- No Tuning Required, Bolt On!
- Custom Powder Coat Finish
- Made in USA
Availability: WCFab Red, WCFab Grey, Gloss Black, and Gloss White in stock and ships in 3-5 business days. 10-15 business day lead time on other colors.
Shipping: This product Cannot Ship to the State of California
Pricing: $809.00
5 5 1

Customize Your Item

- Model Year -
 * required
- Powder Coating -
 * required
- Tag (Logo) Finish (PCUCTAG) -
 * required
- PCV Valve -
 * required
- Spare 4" Air Filter -
 * required


WCFab 2011-2016 GM LML 6.6L Duramax 4" Intake Kit with Air Box Stage 2.

This high-flow, fabricated aluminum intake pipe and air box enclosure with dry filter assembly replaces the restrictive plastic factory parts on your diesel for improved engine performance. The new design significantly increases airflow to your turbo, producing improved horsepower and torque, quicker throttle response, and cooler intake temperatures by drawing cold air through the inner fender. All aluminum construction features large diameter 4" piping with smooth aerodynamic bends to improve intake air velocity volume and provide more aggressive engine and turbo sound during acceleration. High-quality hardware, silicone boots, seals, and stainless steel t-bolt clamps ensure optimum durability and ease of installation.

Removable air box lid element  allows for easy visual inspection and maintenance of your WCFab filter with included hydrophobic pre-filter cover to help keep your MAF sensor, turbo, and engine airways contaminant free.

Includes High Flow 4.8 in. Cast Aluminum Turbo Intake Horn removes restrictions in the OEM setup to improve turbo spool and top-end power and eliminates factory resonators for improved appearance and more aggressive turbo sound. This High Flow 4.8 in. horn is fully compatible with OEM and upgraded drop-in VGT style turbochargers.

Full assembly finished in your choice of WCFab's signature custom powder coat colors for a look as unique as your truck.

Air box is NOT compatible with intake pipe from kits WCF100337, WCF100689, or WCF100691.

Replaces the following GM Part Numbers: 23467660, 20917396, 15819728, 25881207, 20847795, 23210121, 22870902

***Not compatible with aftermarket LML Y-bridges that change the manifold/bridge inlet from the original factory (driver side inlet) location***

***NOTE: 2011 MODEL YEAR TRUCKS MUST UPDATE PCV Regulating Valve to 2012-2016 model year spec to allow correct fitment and compatibility with this part***




Shipping Information

  • Item Requires Shipping
  • 13.0 lbs.
  • W36.0000” x H18.0000” x L12.0000”
  • This item ships in its own box.
  • This product Cannot Ship to the State of California

Customer Reviews

Comment Total Reviews (1)

Good product and simple
  • Currently 5/5 Stars

Reviewed by:

Product ownership: Less than 1 week

Purchased from: Wehrli Custom Fabrication - WCFab

When package was delivered was very well packaged nothing was scratched. The install went smoothly for the most part just getting that intake horn in is a little tricky not much room to play with but you have to change out the factory clap with the one they sent or you won’t get it on. But other then that love the setup definitely gave more turbo sounds but seemed to help with the response when you first get on it but for first impressions I’d give it a 9/10

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