About this product
Everything from the fender to the Y-bridge, in one box. The Wehrli Stage 2 High Flow Intake Bundle Kit (Manufacturer Part # WCF100414) for the 2020-2026 Chevrolet Silverado / GMC Sierra 2500HD/3500HD 6.6L Duramax L5P combines their Stage 1 charge pipe bundle with the Stage 2 intake kit — 4" fabricated intake, horn, sealed air box, and both intercooler pipes. No tuning required, but there is one setting you must change before you start the truck. Read the Notes.
Why Choose the Wehrli Stage 2 High Flow Intake Bundle Kit?
- Intake and charge piping together – the plastic inlet parts and both restrictive charge pipes handled in one order instead of three.
- 4" intake with a bigger horn – 14 gauge aluminum with smooth aerodynamic bends, and an intake horn over an inch larger in diameter than the OEM piece.
- Cold air from the hood duct and fender – the 10 gauge aluminum air box draws through the factory ram air duct, which drops intake temperatures rather than just relocating the filter.
- 3" one-piece hot side – deletes the OEM middle boot joint, one less place to leak.
- 3.5" cold side with a machined flange – CNC machined with a double O-ring seal and an upgraded silicone boot, replacing the two-piece plastic and rubber factory pipe that splits.
- Serviceable filter – removable air box lid element and a hydrophobic Outerwears pre-filter cover protecting the MAF sensor and turbo.
- Custom powder coat – the whole assembly in your choice of Wehrli's colors. Made in the USA.
Kit Includes
- 4" aluminum intake pipe, 14 gauge
- 4" intake horn with PCV port and Surge Ring
- Air box enclosure, 10 gauge aluminum, with dry filter assembly and Outerwears pre-filter cover
- 3" driver (hot) side intercooler pipe, one piece
- 3.5" passenger (cold) side intercooler pipe with CNC machined double O-ring flange
- Installation hardware, 4" silicone hump boot and stainless steel T-bolt clamps
- Reinforced silicone boots, O-rings and clamps
Installation Highlights
Bolt-on with basic hand tools, no tuning required. Factory connection points and sensors are retained. Disable the air filter monitoring system before the first start — the procedure is at the end of Wehrli's install guide, linked below.
Fits These Models
2020, 2021, 2022, 2023, 2024, 2025 and 2026 Chevrolet Silverado 2500HD/3500HD and GMC Sierra 2500HD/3500HD with the 6.6L Duramax L5P.
Specifications
- Intake pipe: 4" diameter, 14 ga. aluminum
- Intake horn: 4" with PCV port and Surge Ring, over an inch larger than OEM diameter
- Air box: 10 ga. aluminum sheet, removable lid element
- Driver (hot) side pipe: 3" diameter, one piece, OEM middle boot joint deleted
- Passenger (cold) side pipe: 3.5" diameter with CNC machined double O-ring flange
- 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
- Stage 1 bundle plus Stage 2 intake - the full inlet and charge path in one kit.
- 4" intake, 3" hot side, 3.5" cold side - every factory restriction upsized.
- 10 ga. sealed air box - fed by the factory ram air duct.
- CNC machined double O-ring flange - seals where the plastic pipe fails.
- No tuning required - bolt on to a stock truck.
- Custom powder coat finish - pick your color above.
Notes
- ⚠ Disable the air filter monitoring system before initial start up and idle. Wehrli is explicit about this: skip it and the truck throws a SERVICE AIR FILTER message that requires a dealership visit to reset. When the setting is right, air filter life reads as disabled. The steps are at the end of the install guide.
- Lead time varies by color. WCFab Red, WCFab Grey, Gloss Black, Gloss White, Candy Teal and Illusion Purple are stocked and ship in 3-5 business days. All other colors are made to order on a 10-15 business day lead time.
- Stage 3 for this truck adds the 3.5" down pipe on top of this kit.
Installation Instructions Available Here
FASS SKU: WCFWCF100414
Manufacturer Part #: WCF100414
Questions? We’re Here to Help.
Have questions about upgrades for your 6.6L Duramax L5P? 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.
