WEHRLI CUSTOM FAB WCF100349 DRIVER (HOT) SIDE 3" INTERCOOLER PIPE KIT FOR 2001-2004 LB7 DURAMAX

Wehrli WCF100349 LB7 Driver (Hot) Side 3" Intercooler Pipe Kit

The WEHRLI WCF100349 2001-2004 LB7 DURAMAX DRIVER (HOT) SIDE 3" INTERCOOLER PIPE KIT is a high-flow upgrade designed to replace the restrictive factory hot-side intercooler pipe and low-quality silicone boots on your LB7 Duramax. This one-piece 3" pipe creates a smooth, consistent charge-air path from the turbo outlet to the intercooler, improving durability and airflow while cleaning up the engine bay for future upgrades.

Built from mandrel-bent aluminum with heavy-duty straight silicone boots and T-bolt clamps, this kit is ideal for stock turbo trucks as well as LB7s running WCFab Y-bridge and S400/stock compound turbo setups that demand a full 3" hot-side tract.

Key Features & Benefits

• 1-piece 3" driver (hot) side intercooler pipe designed for 2001-2004 LB7 Duramax trucks.
• Full 3" intake tract from turbo to intercooler for reduced restriction and improved airflow.
• Replaces factory crimped pipe and low-grade silicone boots that are prone to failure under higher boost.
• Straight, high-pressure rated silicone boots – no angled OE-style couplers to balloon or blow out.
• Includes T-bolt clamps for a secure, leak-resistant connection at elevated boost pressures.
• Durable custom powder-coated finish with multiple color options to match your engine bay theme.
• Works great on stock trucks and as part of larger Wehrli turbo and Y-bridge upgrade packages.
• No special tuning required – direct bolt-on hardware upgrade.

What's Included

• 3" mandrel-bent aluminum driver (hot) side intercooler pipe.
• High-pressure straight silicone boots for turbo and intercooler connections.
• Heavy-duty T-bolt clamps for each connection point.
• All required hardware for a straightforward, bolt-on installation.

Vehicle Fitment

This kit is engineered specifically for LB7 applications:

• 2001-2004 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LB7
• 2001-2004 GMC Sierra 2500HD / 3500HD 6.6L Duramax LB7

Designed to work with factory or stock-location intercoolers. Ideal companion upgrade for trucks running WCFab Y-bridge kits or S400/stock compound turbo kits where a full 3" hot-side pipe helps maintain consistent boost and lower charge-air temperatures.

Installation & Tuning Notes

• Direct replacement for the OEM hot-side intercooler pipe and associated boots on LB7 Duramax trucks.
• No tuning changes are required; this kit simply improves airflow and reliability in the charge-air system.
• Always verify clearances around the fan shroud, belts, and other under-hood components after installation, especially on trucks with body lifts or non-stock engine mounts.
• Re-check all T-bolt clamps after a few heat cycles to confirm proper clamp torque and leak-free operation.

Recommended Wehrli & CPP Diesel Upgrades

For a complete 3" charge-air system and intake path on your LB7, pair the WCF100349 pipe with these Wehrli components available from CPP Diesel:

• WEHRLI WCF100411 2001-2004 LB7 DURAMAX STAGE 1 HIGH FLOW INTAKE BUNDLE KIT – includes 3" Y-bridge and both hot and cold side intercooler pipes for a full intake and charge-air upgrade.
• WEHRLI WCF100693 2001-2004 LB7 DURAMAX Y-BRIDGE KIT – high-flow 3" Y-bridge kit to remove restrictive factory cast components.
• WEHRLI WCF100570 2001-2004 LB7 DURAMAX S400/STOCK TWIN (COMPOUND) TURBO KIT – compound turbo kit that pairs perfectly with a full 3" intercooler pipe setup.

OEM Cross-Reference

This driver side 3" intercooler pipe kit is designed as a high-performance replacement for the following GM part numbers:

• 15061708
• 15040102
• 15124211
• 15201683
• 15019995

Specifications

FAQ

The factory hot-side pipe necks down and uses angled, low-quality boots that can balloon or blow off under higher boost. The WCF100349 kit provides a full 3" mandrel-bent aluminum pipe with straight, high-pressure boots and T-bolt clamps for better airflow and much improved reliability.

No special tuning is required. This is a bolt-on hardware upgrade that improves the durability and efficiency of the charge-air system. Any tuning changes would be related to other performance modifications on the truck, not this pipe by itself.

Yes. This driver side 3" intercooler pipe is commonly used alongside WCFab Y-bridge kits and WCFab S400/stock compound turbo kits on LB7 trucks. It helps maintain a consistent 3" charge-air path for better spool-up and cooler EGTs when used with matching Wehrli components.

Absolutely. The WCF100349 kit is designed to bolt up to the stock-location intercooler and turbo on LB7 trucks, making it a great first upgrade even if you plan to add larger turbos and supporting mods later on.

Because it modifies charge-air plumbing on a diesel truck, this product may not be CARB legal for on-road use in California and certain other emissions-controlled areas. Always check your local and state regulations before installing on a street-driven vehicle.