Does this kit require a tuner or ECU reflash?

No. This is a bolt-on kit that works with the factory ECU. All sensor locations and connection points remain stock, so no tuning or reflashing is needed.

What comes in the box?

The kit includes the 4-inch intake pipe with air box enclosure and dry filter, Outerwears pre-filter cover, 4.8-inch turbo intake horn, 3-inch driver-side intercooler pipe, 3.5-inch passenger-side intercooler pipe, 3-inch two-piece Y-Bridge with upper crossover and lower intercooler pipes, plus all silicone boots, T-bolt clamps, O-rings, and installation hardware.

How does this compare to buying the Stage 1 and Stage 2 parts separately?

This bundle combines the Stage 1 High Flow Bundle (intake pipe, horn, air box) with the Stage 2 intercooler pipes and Y-Bridge. Purchasing them together saves you over $196 compared to buying each piece individually.

Will this work with aftermarket intercoolers?

CSF aftermarket intercoolers need modification or grinding of the intercooler outlet lip to work with this kit. The factory intercooler requires no changes.

Wehrli 06-07 Chevrolet Duramax 6.6L LBZ Stage 2 High Flow Intake Bundle Kit - WCFab Red

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Specifications

Brand: Wehrli
Part #: WCF100437-RED
UPC: WCF100437-RED

Wehrli 06-07 Chevrolet Duramax 6.6L LBZ Stage 2 High Flow Intake Bundle Kit - WCFab Red

Name: Wehrli 06-07 Chevrolet Duramax 6.6L LBZ Stage 2 High Flow Intake Bundle Kit - WCFab Red
Brand: Wehrli
Price: 2698.24 USD
Availability: InStock

$2698.24

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 2006-2007 Chevy/GMC 6.6L Duramax LBZ. Complete Stage 2 high flow intake, intercooler pipe, and Y-bridge bundle in WCFab Red.

Key Features

Fits 2006-2007 Chevrolet Silverado and GMC Sierra 2500 HD/3500 with 6.6L LBZ Duramax
4-inch aluminum intake pipe with air box, dry filter, and Outerwears pre-filter cover included
4.8-inch turbo intake horn offers 20% better airflow than the factory unit
3-inch one-piece driver-side intercooler pipe replaces the restrictive 2.5-inch stock tube
3.5-inch passenger-side intercooler pipe improves airflow by 47% over the factory plastic piece
3-inch Y-Bridge with CNC billet flanges replaces the factory slip-fit design that fails under boost

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Will this fit your vehicle?

Moderate difficulty to install

Bolt-on installation requiring removal of factory intake components, intercooler pipes, and Y-bridge -- no cutting, welding, or tuning needed.

Product Details

Built for the 2006-2007 Chevrolet Silverado and GMC Sierra HD trucks with the 6.6L LBZ Duramax, this Wehrli Custom Fab Stage 2 High Flow Bundle Kit addresses the entire intake tract from air filter to engine. It bundles the intake pipe, air box, turbo intake horn, both intercooler pipes, and the Y-bridge into a single package, finished in WCFab Red powder coat.

Starting at the front, the 4-inch aluminum intake pipe and enclosed air box with dry filter draw cold air through the inner fender, with an Outerwears hydrophobic pre-filter cover protecting the MAF sensor and turbo. The 4.8-inch intake horn is the largest available for this platform, giving you a 20% airflow improvement over the factory part. All of these pieces are constructed from 14-gauge aluminum with smooth mandrel bends for consistent airflow.

Moving downstream, the intercooler pipes replace two known weak spots in the factory design. The driver-side hot pipe jumps from the stock 2.5-inch diameter to a one-piece 3-inch tube with reinforced silicone boots and stainless T-bolt clamps. The passenger-side cold pipe swaps the factory's leak-prone plastic and rubber assembly for a 3.5-inch aluminum piece that flows 47% better than stock, sealed with CNC machined flanges and double O-rings to handle higher boost pressures without blowing apart.

The centerpiece of this bundle is the 3-inch Y-Bridge, replacing the factory slip-fit design that's known for separating under boost. Wehrli's bolt-together version uses CNC billet flanges and mandrel-bent pipes to deliver a full 3-inch flow path from the intercooler pipes through the bridge, flowing 36% better than stock. It retains the factory grid heater and EGR connections for emissions-compliant operation. No tuning required, and the bundle saves over $196 versus buying each component individually.