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Air and Fuel› Air Cleaners, Filters, Intakes and Components

WCFab (Wehrli

4-Inch Intake Kit

Name: 4-Inch Intake Kit
Brand: WCFab (Wehrli
SKU: WCF100344

$625.00 $606.25 Save $18.75

SKU: WCF100344

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Overview

The WCFab WCF100344 is a 4-inch intake kit designed for 2017-2019 GM Duramax L5P diesel engines. This kit features a fabricated aluminum intake pipe and an aluminum air box enclosure with a lid, replacing restrictive factory plastic components.

It includes a dry air filter with an Outerwear's pre-filter cover and is finished with a custom single-stage powder coating.

Show original supplier description

The WCFab WCF100344 is a 4-inch intake kit specifically engineered for 2017-2019 GM Duramax L5P 6.6L diesel engines, including the Chevrolet Silverado 2500/3500 HD and GMC Sierra 2500/3500 HD. This high-flow system replaces restrictive factory plastic intake parts with a fabricated aluminum intake pipe and an aluminum air box enclosure. The kit aims to improve engine performance by significantly increasing airflow to the turbo, leading to potential gains in horsepower and torque, quicker throttle response, and cooler intake temperatures. The design utilizes smooth, aerodynamic bends in the 4-inch piping to enhance intake air velocity and volume, also contributing to a more aggressive engine and turbo sound. Included components feature a dry air filter with a hydrophobic Outerwear's pre-filter cover to help protect the MAF sensor, turbo, and engine airways from contaminants. The air box lid is removable for easy filter inspection and maintenance. The kit integrates with the factory hood's ram air ducting for optimal cold air intake. Installation is straightforward with basic hand tools, and the kit is designed as a direct bolt-on with no tuning required. It is compatible with stock trucks, meaning no other modifications or upgrades are necessary for fitment. The entire assembly is finished in WCFab's signature custom single-stage powder coating for a unique aesthetic. Please note that this part is not available to ship to California.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

Brand	WCFab (Wehrli
Part Number	WCF100344
Category	Air and Fuel

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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