Wehrli Custom Fabrication WCF203-1 Billet Aluminum Intake Horn

The Wehrli Custom Fabrication WCF203-1 Intake Horn is a precision-machined billet aluminum replacement intake elbow designed to improve airflow efficiency on GM Duramax diesel engines. Engineered and manufactured in-house at Wehrli Custom Fabrication's facility in Woodridge, Illinois, this intake horn is a direct upgrade over the restrictive factory plastic intake elbow, delivering improved throttle response and increased airflow to the intake manifold.

Key Features:

• Precision CNC-machined from high-quality billet aluminum for superior strength and durability
• Smooth, mandrel-bent interior bore eliminates turbulence and reduces airflow restriction compared to the OEM plastic horn
• Direct bolt-on fitment — no cutting, drilling, or modification required
• Polished or anodized finish options for a clean, professional appearance under the hood
• Significantly more durable than the factory plastic intake elbow, which is prone to cracking and warping under heat
• Designed, engineered, and manufactured in the USA

Wehrli Custom Fabrication is a trusted name in the diesel performance industry, known for producing high-quality billet aluminum components that combine form and function. The WCF203-1 Intake Horn is an ideal upgrade for Duramax diesel truck owners looking to improve engine breathing, reliability, and underhood aesthetics.