Wehrli Custom Fab 3in High Flow Y-Bridge Kit for 2001-2004 Chevrolet/GMC (LB7 Duramax) S300/S400 - Raw (WCF100615-RAW)

Fits 2001-2004 Chevrolet Silverado and GMC Sierra 2500 HD/3500 (LB7 Duramax) equipped with S300 or S400 single turbocharger configurations.

The factory LB7 Duramax Y-bridge is a notorious bottleneck that limits intake efficiency and power potential in high-performance builds. The Wehrli Custom Fab (WCFab) 3-inch High Flow Y-Bridge eliminates this restriction by providing a larger, more direct air path to the intake runners. Specifically designed for custom fabrication and aftermarket turbo setups, this bridge bolts to the factory intake runners and features a 3-inch bead-rolled connection at the inlet for secure plumbing.

Construction features a 14-gauge aluminum neck TIG-welded to a CNC-machined billet aluminum center section and flanges for maximum strength under boost. This kit includes critical components for a professional installation, including an FPRV block-off kit to provide the necessary clearance from the bridge to the fuel distribution block.

• Material: 14-gauge aluminum neck with CNC-machined billet aluminum flanges
• Construction: Hand-built TIG-welded design
• Ports: Integrated MAP sensor bung and 1/8" NPT accessory port (for boost gauge or sensor)
• Clearance Requirements: Requires minimum T4 pedestal height of 5" for S300 turbos or 6" for S400 turbos
• Finish: Raw aluminum (requires painting, polishing, or powder coating before use to prevent oxidation)
• Includes: 3" silicone boot, stainless steel T-bolt clamps, MAP sensor bracket and seal, new O-ring flange seals, and FPRV block-off kit
• Origin: Made in USA
• MPN: WCF100615-RAW

Note: This is not a direct OEM replacement and is intended for custom turbocharger installations.