Cummins
Shop All
SKU #: WCF-WCF100194-FB
MPN #: WCF100194-FB
Wehrli Custom Fab 4" Cold Air Intake Kit With Air Box 11-16 GM 6.6L Duramax LML
Description
If you plan on getting the most out of your Duramax, you need the air for it! Remove restrictive stock piping with Wehrli Custom Fabrication's 4" Cold Air Intake Kit with a variety of colors to show off your truck every time you pop the hood.
NOTE: While some colors are kept in stock, other colors will take an extra 10-15 business day delay in powder coating.
If you’re looking to improve performance and efficiency on your LML Duramax, upgrading your intake system is one of the most effective first steps. The Wehrli Custom Fab LML Duramax Cold Air Intake Kit with Air Box is designed to increase airflow, improve throttle response, and give your engine bay a clean, custom appearance.
This intake replaces the restrictive factory air box with a high-flow intake tube and sealed air box system, helping deliver cooler, denser air to your turbocharger. Improved airflow allows your truck to respond quicker, perform better under load, and maintain consistent power whether you're towing, daily driving, or running performance tuning.
The sealed air box design helps reduce heat soak from the engine bay, ensuring your intake pulls in cooler outside air for improved combustion efficiency. This is especially important for LML trucks that see heavy towing or extended drive times.
Constructed from high-quality fabricated materials, this intake kit is built for durability and long-term reliability. Each unit is finished in your choice of WCFab custom powder coat colors, giving your engine bay a standout look every time you open the hood.
Enter your zip and we'll see if installation is available.
- Request quotes from local installers at checkout
- Compare options and choose the best fit for your install
About WrenchConnected
WrenchConnected is an independent installation marketplace operating in partnership with Diesel Power Products.
How it works
After checkout, we route your vehicle info and part SKU to verified installation shops near you. Local installers review the job and submit competitive bids; you pick the shop you want based on price, reviews, and availability. Your name and email stay private until you select an installer.
Pricing
You pay for the bid from your preferred shop. The full amount is shown before you confirm — installers cannot add charges without your written consent. Payments are processed securely by Stripe.
Your privacy
During bidding, shops see only your service ZIP code, vehicle year/make/model, and the part SKU — not your name, email, or address. Only the shop you select receives your contact details after payment. We never sell your personal information.
More detail at wrenchconnected.com.
FEATURES & BENEFITS:
- Improves airflow and turbocharger efficiency
- Enhances throttle response and drivability
- Sealed air box design helps reduce intake air temperatures
- High-quality fabricated construction for durability
- Reusable high-flow air filter
- Custom powder coat finish options
- Direct bolt-on installation
About Wehrli Custom Fabrication
Born from a garage dream in Sandwich, Illinois, and now headquartered in DeKalb, Illinois, Wehrli Custom Fabrication (WCFab) has earned a formidable reputation in the diesel performance world. From its hands-on beginnings to its expansion into a team of 50-plus skilled builders, WCFab continues to elevate diesel upgrades, even as the brand evolves into fabrication and powder coating excellence.
At its core, Wehrli is dedicated to powering Duramax, Powerstroke, and Cummins trucks with rugged, high-performance parts that meet the real-world demands of hauling, towing, and racing. Every product is proudly Made in the USA, from turbo kits and cold air intakes to heavy-duty Allison transmission builds capable of handling up to 750hp, thoroughly crafted in a climate-controlled clean room.
Whether you’re upping airflow with precision CNC-machined intakes and intake horns, clearing the engine bay with billet block-off plates, or commanding raw transportation power with a 750+hp Allison transmission, Wehrli’s work is synonymous with resilience and peak performance. Products like their L5P Duramax high-flow turbo intake horn boast a 27% increase in flow, proving that function and form can coexist beautifully.
Customer support is a serious affair at WCFab they stand firmly behind their fits and finishes Led by the Wehrli brothers and a crew fueled by diesel passion, the brand’s mission is clear: deliver top-tier craftsmanship, unmatched performance, and relentless customer service.
Wehrli Custom Fabrication—where diesel dreams are forged into reality, in metal you can feel and performance you can trust.
Blog
June 12, 2026
The diesel particulate filter (DPF) on your Cummins engine traps soot before it leaves the tailpipe. Over...
Read MoreCummins DPF Cleaning: Signs, Methods & Tips
June 12, 2026
P2509 flags when your Cummins ECM isn't seeing stable voltage coming from the battery and charging system....
Read MoreP2509 Cummins Code: Causes, Symptoms & Fixes
June 10, 2026
It starts small. Maybe the truck is a little slower to spool than usual. Maybe it sounds...
Read MoreHow to Find a Boost Leak Without Special Tools
June 05, 2026
Your exhaust system moves spent gases out of the engine and away from the cab. The muffler...
Read MoreResonator vs Muffler: Key Differences Explained