About this product
Replace the restrictive plastic inlet on your 2011-2016 Chevrolet Silverado / GMC Sierra 2500HD/3500HD 6.6L Duramax LML with the Wehrli 4" Stage 2 Intake Kit with Air Box (Manufacturer Part # WCF100304). Fabricated 4" aluminum pipe, sealed 10 gauge air box with a dry filter, and a 4.8" cast aluminum turbo intake horn that deletes the factory resonators. Wehrli measures 37% more airflow than the stock intake. Bolt on, no tuning required.
Why Choose the Wehrli 4" Stage 2 Intake Kit with Air Box?
- 37% more airflow than stock – Wehrli's own figure for the intake, plus another 5.6% over the stock intake horn, from 4" piping with smooth aerodynamic bends instead of molded plastic corners.
- 4.8" cast aluminum turbo intake horn included – removes the OEM restriction and eliminates the factory resonators, which cleans up the engine bay and lets the turbo actually be heard. Compatible with the OEM charger and with drop-in VGT style upgrades.
- Cold air from the inner fender – the sealed box pulls cooler air than the factory setup, so intake temperatures drop.
- 10 gauge aluminum box and lid – and the lid element comes off for a filter inspection without dismantling anything.
- Dry filter with a hydrophobic pre-filter cover – the Outerwears cover keeps water and grit off the element, protecting the MAF sensor, turbo and engine airways.
- Silicone boots and stainless T-bolt clamps – sealed properly, and easier to install than the factory clip hardware.
- Custom powder coat – finished in your choice of Wehrli's colors. Made in the USA.
Kit Includes
- 4" intake pipe, 14 gauge aluminum
- 4.8" high flow cast aluminum turbo intake horn
- Air box and lid, 10 gauge aluminum sheet
- Dry air filter
- Outerwears pre-filter cover
- Silicone boot and stainless steel T-bolt clamps
- Installation hardware
Installation Highlights
Installs easily with basic hand tools and needs no tuning — it bolts onto an otherwise stock truck. The removable air box lid keeps ongoing filter service to a couple of minutes.
Fits These Models
2011, 2012, 2013, 2014, 2015 and 2016 Chevrolet Silverado 2500HD/3500HD and GMC Sierra 2500HD/3500HD with the 6.6L Duramax LML.
Specifications
- Intake pipe: 4" diameter, 14 gauge aluminum
- Turbo intake horn: 4.8" high flow cast aluminum, compatible with OEM and drop-in VGT style turbochargers
- Air box and lid: 10 gauge aluminum sheet
- Filter: dry element with Outerwears hydrophobic pre-filter cover
- Airflow: 37% improvement over the stock intake, 5.6% over the stock intake horn, per Wehrli
- Replaces GM part numbers: 23467660, 20917396, 15819728, 25881207, 20847795, 23210121, 22870902
- Shipping weight: 13.0 lbs
- Package dimensions: 36" W x 18" 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
- 37% airflow gain over stock - measured by Wehrli, not estimated.
- 4.8" cast turbo horn included - resonators deleted, VGT drop-in compatible.
- 10 gauge aluminum air box - sealed, serviceable, no plastic.
- Dry filter with Outerwears cover - protects the MAF sensor and turbo.
- No tuning required - bolt on to a stock truck.
- Custom powder coat finish - pick your color above.
Notes
- ⚠ 2011 model year trucks must update the PCV regulating valve to 2012-2016 model year spec for this part to fit and function correctly. If you have a 2011, sort the valve before you install.
- ⚠ Not compatible with aftermarket LML Y-bridges that relocate the manifold or bridge inlet away from the original factory driver side inlet position.
- The air box is not compatible with the intake pipe from kits WCF100337, WCF100689 or WCF100691.
- Lead time varies by color. WCFab Red, WCFab Grey, Candy Teal, Bengal Red, Gloss Black and Gloss White are stocked and ship in 3-5 business days. All other colors are made to order on a 10-15 business day lead time.
Installation Instructions Available Here
FASS SKU: WCFWCF100304
Manufacturer Part #: WCF100304
Questions? We’re Here to Help.
Have questions about upgrades for your 6.6L Duramax LML? Contact FASS Motorsports and we’ll get you dialed:
Phone: 636-429-7020
Email: info@fassmotorsports.com
Description supplied by FASS Motorsports through its current Shopify listing. Product, performance, and health claims are the seller’s and have not been independently verified by StorkScout.
