Wehrli Custom Fabrication WCF100503-RED Stage 3 High Flow Bundle Kit 2006-2007 LBZ Duramax

The Wehrli Custom Fabrication Stage 3 High Flow Bundle Kit is a comprehensive performance upgrade system designed specifically for 2006-2007 Chevrolet Silverado and GMC Sierra 2500/3500 HD trucks equipped with the 6.6L LBZ Duramax engine. This complete kit combines WCFab's popular Stage 2 High Flow Bundle with a 3-inch stainless steel down pipe, delivering increased air and exhaust flow for improved turbo efficiency, throttle response, and faster turbo spool-up.

Key Features:

• 4-inch aluminum intake pipe with air box enclosure, dry filter assembly, and Outerwears pre-filter cover
• 4.8-inch turbo intake horn with PCV port - the largest on the market providing 20% airflow improvement over stock
• 3-inch hot side intercooler pipe and 3.5-inch cold side intercooler pipe - upgrades restricted 2.5-inch factory pipes
• WCFab's signature 3-inch stainless steel down pipe for enhanced exhaust flow
• High-quality hardware, silicone boots, seals, and stainless steel T-bolt clamps included
• Finished in WCFab Red powder coat with standard brushed tag
• All aluminum 14-gauge construction for durability
• Removable air box lid for easy filter inspection and maintenance

This Stage 3 kit eliminates weak points in the factory design that contribute to lost power, boost leaks, and component failures in hard-working and high-performance applications. The high-flow intake system replaces restrictive plastic factory components, significantly increasing airflow to the turbo while producing improved horsepower and torque. The cold air intake design draws cooler air through the inner fender, reducing intake temperatures for better performance. The upgraded intercooler pipes replace the leak-prone plastic and rubber factory pipes with heavy-duty 1-piece aluminum construction for reliable boost delivery.

Made in the USA by Wehrli Custom Fabrication in DeKalb, Illinois, this kit includes all necessary installation hardware for a complete bolt-on upgrade.