3 inch Drivers Side Intercooler Pipe

Features:

• Fits 2001–2004 6.6L Duramax LB7
• Replaces factory driver side intercooler pipe
• Full 3-inch intake tract design
• Includes high-pressure silicone boots
• Comes with heavy-duty T-bolt clamps
• No tuning required after installation
• Works with S400 and Y-Bridge kits
• Straight boot design for better sealing
• Durable powder-coated finish
• Improves airflow to the engine
• Designed for high-boost applications

A Clean Upgrade for Boosted Performance

If you're looking to tighten up your charge air system and clean up the engine bay on your LB7 Duramax, the Wehrli 100349 3-Inch Driver Side Intercooler Pipe is a solid solution. Designed for 2001–2004 Silverado and Sierra 2500HD/3500HD trucks, this pipe replaces the restrictive factory setup with a full 3-inch intake tract from the turbo to the engine. The difference is noticeable—stronger airflow, more consistent boost, and a cleaner, more direct route for charged air. It’s especially ideal if you’re running Wehrli’s S400 over stock twin turbo kit or their LB7 Y-Bridge, as this pipe complements both systems perfectly without the need for tuning.

Built to Handle the Pressure, Designed to Fit Right

This isn’t just a cosmetic upgrade. Wehrli uses straight, high-pressure rated silicone boots instead of the angled factory ones, which improves reliability and eliminates one of the more common failure points in high-boost applications. Heavy-duty T-bolt clamps are included to lock everything down and hold boost without slipping under pressure. The powder-coated finish adds durability and a sharp look that holds up in harsh engine bay environments. Whether you’re fine-tuning a performance build or just replacing worn-out stock parts, this pipe offers a straightforward install and a noticeable improvement in how your truck breathes and responds under load. It’s a clean, durable, and functional upgrade that does its job well without needing extra tuning or hassle.

Fits: 2001, 2002, 2003, 2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7