Image coming soonWehrli 2006-2007 LBZ Duramax 4" Intake Kit with Air Box Stage 2
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.
Replace the restrictive plastic factory intake on your 2006-2007 Chevrolet Silverado / GMC Sierra 2500HD/3500HD 6.6L Duramax LBZ with the Wehrli Stage 2 4" Intake Kit with Air Box (Manufacturer Part # WCF100302). Fabricated 14 gauge aluminum pipe, a sealed 10 gauge air box with a dry filter, and the 4.8" cast turbo intake horn — the largest on the market, worth 20% more airflow than stock on its own.
Why Choose the Wehrli Stage 2 4" Intake Kit?
- Includes the 4.8" intake horn – this is the Stage 2 difference. CNC machined cast aluminum, the largest inlet available for this truck, 20% more airflow than the OEM horn.
- Cold air from the inner fender – the sealed box pulls cooler air than the factory arrangement, dropping intake temperatures.
- 4" pipe in 14 gauge aluminum – large diameter with smooth aerodynamic bends, improving intake air velocity and volume.
- 10 gauge aluminum box and lid – the lid element lifts off for a filter check without pulling the box apart.
- Resonator connection eliminated – cleaner engine bay, more turbo and engine sound under acceleration.
- PCV port machined into the horn – crankcase vent handled properly.
- Custom powder coat – the whole assembly in your choice of Wehrli's colors. Made in the USA.
Kit Includes
- 4" intake pipe, 14 gauge aluminum
- 4.8" inlet cast aluminum intake horn with PCV port
- Air box and lid, 10 gauge aluminum sheet
- Dry air filter
- Outerwears pre-filter cover
- Silicone reducer boot, stainless steel T-bolt clamps and O-ring seal
- Installation hardware
Installation Highlights
Installs easily with basic hand tools. The removable air box lid keeps ongoing filter service to a couple of minutes.
Fits These Models
2006 and 2007 Chevrolet Silverado 2500HD/3500HD and GMC Sierra 2500HD/3500HD with the 6.6L Duramax LBZ.
Specifications
- Intake pipe: 4" diameter, 14 gauge aluminum
- Intake horn: 4.8" inlet, CNC machined cast aluminum, 20% airflow improvement over stock
- Air box and lid: 10 gauge aluminum sheet
- Filter: dry element with Outerwears hydrophobic pre-filter cover
- Replaces GM part numbers: 19167951, 89060671, 15837090, 25839609, 98011738
- Shipping weight: 19.0 lbs
- Package dimensions: 36" W x 12" H x 18" L, ships in its own box
- Finish: custom powder coat, color selected above
- Made in the USA
Key Features at a Glance
- 4.8" intake horn included - the Stage 2 difference, 20% more flow.
- 4" fabricated aluminum intake - replaces the factory plastic.
- 10 ga. sealed air box - serviceable lid, cold air from the fender.
- Resonator deleted - better look, more sound.
- Basic hand tools - no drilling, no fabrication.
- Custom powder coat finish - pick your color above.
Notes
- 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.
- The standard 4" intake kit for this truck is the same package without the 4.8" horn.
FASS SKU: [ADD FASS SKU]
Manufacturer Part #: WCF100302
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.
