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Wehrli 04.5-05 Chevrolet 6.6L LLY Duramax 4in Intake Kit Stage 2 - WCFab Red
Unlock serious airflow gains on your 2004.5–2005 Chevrolet 6.6L LLY Duramax diesel with the Wehrli Custom Fabrication 4-inch Stage 2 Intake Kit in WCFab Red. This premium cold air intake kit is designed to dramatically improve airflow volume and air filtration quality over the restrictive factory intake system, supporting noticeable improvements in throttle response, turbo spool, horsepower, and EGT reduction.
The Wehrli Stage 2 intake kit for the LLY Duramax features a large-diameter 4-inch intake tube fabricated from mandrel-bent aluminum in the USA. The WCFab Red powder coat gives it an aggressive, show-quality appearance under the hood. The kit is tuner-friendly and designed to work seamlessly with aftermarket tunes, upgraded turbos, and performance modifications.
Key Features
- Fits: 2004.5–2005 Chevrolet Silverado 2500HD / 3500HD with 6.6L LLY Duramax diesel
- 4-inch Stage 2 cold air intake kit — significant airflow improvement over the factory intake
- Mandrel-bent aluminum intake tube — smooth bore for maximum airflow volume
- WCFab Red powder coat — bold, heat-resistant, show-quality finish
- Includes high-flow air filter for maximum filtration and flow
- Supports increased horsepower, improved turbo response, and reduced EGTs
- Compatible with factory and aftermarket tuning
- Made in the USA by Wehrli Custom Fabrication (WCFab)
- MPN: WCF100637-RED
One of the best bang-for-the-buck performance upgrades available for the LLY Duramax. The Wehrli 4-inch Stage 2 intake kit is a foundational modification for any LLY Duramax performance build — from mild tow rigs to full-pull competition trucks.