GMC Duramax LLY Performance Air Intake by Wehrli (WCFab) — 4 in Intake Kit with Air Box in Bengal Silver for 2004.5–2005 6.6L LLY. A high-flow, fabricated aluminum system that replaces restrictive factory components.

This kit routes cool air from the inner fender to the turbo through large 4 in piping with smooth bends, improving airflow, sharpening throttle response, and helping reduce intake temperatures. The enclosed air box and dry filter, paired with a hydrophobic pre-filter, promote clean MAF readings and consistent performance. Quality hardware, a silicone boot, and stainless T-bolt clamps provide durability and a straightforward, no-tune, bolt-on installation.

Features

• 4 in fabricated aluminum intake pipe and air box
• Dry filter with hydrophobic pre-filter cover
• Draws cold air from inner fender
• Smooth, large-radius bends for improved airflow
• Removable air box lid for quick inspection
• Silicone boot, stainless T-bolt clamps, install hardware
• Bengal Silver powder coat; Made in USA

Ready to customize your LLY with proven airflow gains and durable construction? Call with questions or to schedule installation. We serve Austin, Texas and the Los Angeles, California area with in-house installation and customization: 512-982-9393 (TX), 562-981-6800 (CA).

Thinking about multiple items? Contact us for shipping discounts. We install on premises at both locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov