Does this Stage 2 kit require a tune or any other modifications?

No tuning is required. The Wehrli Stage 2 High Flow Bundle Kit bolts directly onto a stock 06-07 LBZ Duramax truck. All factory connection points and sensors are retained, so no additional modifications are needed.

What is the difference between Stage 2 and Stage 1?

Stage 2 combines the Stage 1 intake kit (intake pipe, horn, and air box) with upgraded intercooler piping and the 3 in. Y-bridge. Stage 1 only addresses the intake side, while Stage 2 upgrades the full airflow tract from the air filter through to the intake manifold.

Is this kit CARB compliant?

No, this kit is not CARB approved. It is intended for off-road or competition use in states that follow CARB emissions regulations. Check your local and state regulations before purchasing.

What kind of maintenance does the dry filter require?

The removable air box lid allows easy visual inspection and maintenance of the filter. The included Outerwears hydrophobic pre-filter cover adds protection against water and debris, helping keep the MAF sensor and turbo airways clean between filter services.

Specifications

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

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

Name: Wehrli 06-07 Chevrolet Duramax 6.6L LBZ Stage 2 High Flow Intake Bundle Kit - Gloss Black
Brand: Wehrli
SKU: wehrli-wehrli-06-07-chevrolet-duramax-6-6l-lbz-stage-2-high-flow-intake-bundle-k-t14-612634
Price: 2703.68 USD
Availability: BackOrder

$2703.68

On Backorder

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

Fits 06-07 Chevy/GMC 2500HD & 3500 with 6.6L LBZ Duramax. Complete Stage 2 high flow intake bundle in Gloss Black with Y-bridge and intercooler pipes.

Key Features

Fits 2006-2007 Chevrolet Silverado 2500 HD, 3500 and GMC Sierra 2500 HD, 3500 with 6.6L LBZ Duramax diesel.
4 in. aluminum intake pipe with enclosed air box, dry filter assembly, and Outerwears hydrophobic pre-filter cover.
4.8 in. turbo intake horn with PCV port offers 20% airflow improvement over the factory intake horn.
Wehrli signature 3 in. two-piece Y-bridge with upper crossover and lower intercooler pipes flows 36% better than stock.
3 in. driver-side (hot) and 3.5 in. passenger-side (cold) intercooler pipes replace restrictive factory components.
Passenger-side intercooler pipe flows 47% better than the stock part.

⚠️ 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 with hand tools; expect 3-5 hours for a complete Stage 2 install on a stock truck.

About this part

Product Details

Full Airflow Overhaul for Your 06-07 LBZ Duramax

If your 2006-2007 Silverado or Sierra HD is still running the factory plastic intake components, you are leaving airflow and performance on the table. This Wehrli Stage 2 High Flow Bundle Kit in Gloss Black replaces the restrictive stock intake tract, intercooler piping, and Y-bridge with a complete bolt-on aluminum system built to move serious air.

On the intake side, a 4 in. aluminum pipe with enclosed air box and dry filter assembly draws cold air through the inner fender for cooler, denser intake charges. The 4.8 in. turbo intake horn -- the largest available for this platform -- gives you a 20% airflow improvement over the stock piece. An included Outerwears hydrophobic pre-filter cover keeps contaminants away from the MAF sensor and turbo.

Intercooler Pipes and Y-Bridge That Actually Hold Together

Anyone who has pushed an LBZ knows the weak spots: the 2.5 in. factory hot-side pipe, the leak-prone plastic cold-side pipe, and the slip-fit Y-bridge that blows apart under boost. This kit addresses all three. The 3 in. driver-side (hot) intercooler pipe and 3.5 in. passenger-side (cold) pipe are made from heavy-duty 14 ga. aluminum with mandrel bends. The cold-side pipe alone flows 47% better than stock.

CNC machined billet flanges with double O-ring seals eliminate boost leaks, and an upgraded silicone hump boot handles higher boost pressures than the factory rubber. The signature Wehrli 3 in. two-piece Y-bridge is a bolt-together design that flows 36% better than stock while retaining the factory grid heater and EGR connections for emissions compliance.

Built Right, Bolts On

Everything in this kit is made in the USA from 14 ga. aluminum. Stainless steel T-bolt clamps, reinforced silicone boots, O-rings, and all necessary hardware are included. No tuning is required, and it fits on a completely stock truck. The Gloss Black powder coat finish ties the whole system together under the hood. You will also save $196 or more compared to buying each component separately.