GMC Sierra 3500 HD Performance Air Intake – Wehrli 4in WCFab, Gun Metal (2020–2025). A high‑flow fabricated aluminum intake and air box replacement for the restrictive factory setup on your 6.6L Duramax L5P.

The 4in smooth‑radius aluminum tube and sealed 10‑gauge air box channel cool air from the hood Ram Air duct, helping reduce intake temps while sharpening throttle response and amplifying turbo sound. A dry filter with pre‑filter keeps debris out, and the durable Gun Metal powder coat looks right at home under the hood. Installs with basic hand tools—no tuning required. Tip: disable the factory air‑filter monitor to avoid service messages.

Features

• 4in aluminum intake tube with high‑flow dry filter
• 10‑gauge aluminum air box and lid; Ram Air hood seal
• Stainless T‑bolt clamps and silicone boot
• Bolt‑on fit for 2020–2025 6.6L Duramax L5P

Questions? Call 512-982-9393 (TX) or 562-981-6800 (CA). Visit us in Austin, Texas or the Los Angeles, California area for installation and customization services.

Buying 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