Wehrli Custom Fabrication (WCFab) is an American performance parts manufacturer and custom metal fabrication company specializing in high-quality diesel truck upgrades for Duramax, Powerstroke, and Cummins platforms. Founded in 2010 and headquartered in DeKalb, Illinois, Wehrli designs, fabricates, and finishes all of its products in the USA using state-of-the-art CNC machining, laser cutting, welding, and in-house powder coating.

This collection features Wehrli diesel performance components including high-flow intake systems, turbo kits and turbo components, intercooler piping, coolant hoses, traction bars, billet engine mounts, and other heavy-duty upgrades built to handle demanding towing, performance, and motorsport applications. Known for precision fitment, durable construction, and performance-driven design, WCFab parts are trusted by diesel enthusiasts and builders looking to improve airflow, increase power, and strengthen critical engine and drivetrain components while maintaining professional-level quality and reliability.