The 2020–2026 L5P WCFab Cold Air Intake Kit with Air Box is a premium, high-performance intake system engineered to replace the restrictive factory air intake on your 6.6L Duramax. Designed for maximum airflow, durability, and factory-style fitment, this system delivers noticeable improvements in throttle response, turbo efficiency, and overall engine performance while maintaining reliable daily drivability.
Built from heavy-duty fabricated aluminum, the system features a 4” high-flow intake tube paired with a fully sealed air box designed to work with the factory hood ram air duct. This allows the engine to draw in cooler, denser outside air instead of hot engine bay air, helping improve combustion efficiency and reduce intake temperatures under load.
The intake includes a high-quality dry performance air filter with Outerwears pre-filter for added protection in harsh environments. Stainless steel T-bolt clamps, reinforced silicone couplers, and precision-fit hardware ensure a secure, leak-free installation built to handle towing, work, and performance driving.
Finished in WCFab’s signature powder coat options, this intake not only performs but also adds a clean, aggressive look to your engine bay. Best of all, it installs as a full bolt-on system with no tuning required and is compatible with stock trucks.
Key Features:
- Fits 2020–2026 GM 6.6L L5P Duramax (2500/3500 HD)
- Full 4” high-flow aluminum intake tube
- Sealed fabricated aluminum air box with factory ram air integration
- Dry performance air filter with Outerwears pre-filter
- Lower intake temps and improved airflow to turbo
- Enhanced throttle response and turbo spool
- Heavy-duty silicone couplers and stainless T-bolt clamps
- Durable powder coat finish in multiple colors
- Fully bolt-on installation (no tuning required)
A proven upgrade for L5P owners looking for better airflow, improved response, and a clean, functional engine bay setup built to last.