Image coming soonWehrli 2006-2007 LBZ Duramax Stage 1 High Flow Intake Bundle Kit
Can I pick up my order or have it installed at your shop?
Can I pick up my order or have it installed at your shop?
Absolutely. We offer local pickup on most products and full professional installation at our shop in Washington, MO. Whether you just want to grab your parts or have our techs handle the install, we’ve got you covered. Give us a quick call at 636-429-7020 or message us to schedule a visit — we’ll make sure the parts are ready when you arrive.
How do I know if this part fits my vehicle?
How do I know if this part fits my vehicle?
Unsure if it’ll fit? No problem — that’s what we’re here for. Send us your vehicle’s year, make, and model, and we’ll verify fitment before you order. We can also point you toward compatible upgrades or supporting parts if needed.
What if I need to return a product or it’s defective?
What if I need to return a product or it’s defective?
Most unused items can be returned within 30 days in their original packaging. Some products are covered by a manufacturer’s warranty as well. If something arrives damaged or doesn’t meet your expectations, just let us know — we’ll help you get it replaced, refunded, or repaired. (Tracking updates are also emailed automatically once your order ships.)
What's the lead time on custom or fabricated parts?
What's the lead time on custom or fabricated parts?
Many of our parts are built to order — especially fabricated or performance components. These can take additional time to produce before shipping. Lead times vary by manufacturer and demand, but we’ll always keep you updated along the way. If you’re working on a tight schedule, reach out before ordering at 636-429-7020 and we’ll confirm current availability or estimated ship dates.
The OEM Y-bridge on a 2006-2007 Chevrolet Silverado / GMC Sierra 2500HD/3500HD 6.6L Duramax LBZ is a slip-fit two-piece design with almost no support, and it blows apart under boost. The Wehrli Stage 1 High Flow Intake Bundle Kit (Manufacturer Part # WCF100323) replaces it with the signature bolt-together 3" two-piece bridge — 36% more airflow than stock — plus both intercooler pipes.
Why Choose the Wehrli Stage 1 High Flow Intake Bundle Kit?
- 36% more airflow than stock – Wehrli's measured figure for the Y-bridge assembly with its upper crossover and lower intercooler pipes.
- Bolts together instead of slipping together – the OEM bridge separates under load, which costs you drivability, fuel economy and power. This one is mechanically fastened with a proper sealing surface at the inlet horn.
- Both intercooler pipes included – 3" hot side replacing the restricted 2.5" OEM pipe, and 3.5" cold side replacing the failure-prone plastic one.
- Wire-reinforced high temperature boots – on the hot side, where heat kills ordinary silicone.
- Keeps the factory emissions configuration – retains the grid heater and EGR connection controls.
- No tuning required – bolts onto a stock truck. Made in the USA.
Kit Includes
- WCFab signature 3" two-piece Y-bridge with upper crossover and lower intercooler pipes
- 3" hot (driver) side intercooler pipe with high temperature wire-reinforced boot
- 3.5" cold (passenger) side intercooler pipe
- Silicone boots, stainless steel T-bolt clamps, O-rings and installation hardware
Fits These Models
2006 and 2007 Chevrolet Silverado 2500HD/3500HD and GMC Sierra 2500HD/3500HD with the 6.6L Duramax LBZ. Confirm the LBZ engine code before ordering — this is LBZ specific.
Specifications
- Y-bridge: 3" two piece, bolt together, 36% airflow improvement over stock
- Hot side pipe: 3" diameter, replacing the OEM 2.5"
- Cold side pipe: 3.5" diameter
- Shipping weight: 35.0 lbs
- Package dimensions: 36" W x 24" H x 12" L, ships in its own box
- Finish: custom powder coat, color selected above
- Made in the USA
Key Features at a Glance
- 36% more airflow than stock - measured by Wehrli.
- Bolt-together Y-bridge - fixes the OEM separation problem.
- Both intercooler pipes included - 3" hot, 3.5" cold.
- Grid heater and EGR retained - emissions configuration intact.
- No tuning required - bolt on to a stock truck.
- Custom powder coat finish - pick your color above.
Notes
- ⚠ Running a CSF aftermarket intercooler? The outlet lip requires grinding for this kit to fit. Plan for it or call us first.
- This is the charge side only. The intake pipe, air box and horn are the Stage 2 kit — a separate part.
- Lead time varies by color. WCFab Red, WCFab Grey, Gloss White and Gloss Black are stocked and ship in 3-5 business days. All other colors are made to order on a 10-15 business day lead time.
FASS SKU: [ADD FASS SKU]
Manufacturer Part #: WCF100323
Questions? We’re Here to Help.
Have questions about upgrades for your 6.6L Duramax LBZ? Contact FASS Motorsports and we’ll get you dialed:
Phone: 636-429-7020
Email: info@fassmotorsports.com
This part fits the following vehicles:
| Years | Make & Model |
|---|---|
| 2006–2007 | Chevrolet Silverado 2500 HD |
| 2006 | Chevrolet Silverado 3500 |
| 2006–2007 | GMC Sierra 2500 HD |
| 2006 | GMC Sierra 3500 |
| 2007 | Chevrolet Silverado 3500 HD |
| 2007 | GMC Sierra 3500 HD |
Fitment is listed by year, make and model. Some applications also depend on cab, bed, drivetrain or engine — if you are not sure, call 636-429-7020 or send us your vehicle details and we will confirm before you order.
