Wehrli Custom Fabrication WCF100163-GRY High Flow Y-Bridge Kit LBZ Duramax Engine Intake Manifold - 3 Grey

The Wehrli Custom Fabrication WCF100163-GRY is a high-performance 3" Y-Bridge kit designed to replace the restrictive factory upper intake manifold on 2006-2007 LBZ 6.6L Duramax engines. This complete bolt-together upgrade eliminates the poorly designed OEM slip-fit Y-bridge that is prone to failure under boost conditions, replacing it with a robust two-piece design that provides superior airflow and reliability.

Performance and Design Features:

• 36% improvement in airflow over stock design
• Full 3" mandrel-bent upper and lower intercooler pipes with smooth flowing bends
• CNC machined billet aluminum flanges for precise fitment and secure connections
• Bolt-together construction provides secure sealing surface at air inlet horn connection
• Integrates factory grid heater and EGR connection controls
• Compatible with OEM lower passenger side intercooler pipe or upgraded WCFab 3.5" pipe kit (WCF100367)
• Custom WCFab Grey powder coat finish for durability and show-quality appearance

Complete Kit Includes:

• WCFab signature 3" two-piece Y-bridge
• 3" upper intercooler crossover pipe
• 3" lower intercooler pipe
• High-quality silicone boots and stainless steel T-bolt clamps
• MAP sensor seal
• High-temperature O-ring seals for grid heater and EGR
• Y-bridge O-ring flange seals
• New up-pipe to EGR gasket
• New grid heater installation hardware

This kit is designed for direct bolt-on installation on stock trucks with no tuning required, though it pairs exceptionally well with emissions-compliant tuning and drop-in turbochargers for maximum performance gains. Proudly made in the USA at WCFab's state-of-the-art facility in DeKalb, Illinois. Replaces GM part numbers 97363569, 97363568, 97364407, and 97374352.