Wehrli 2020-2026 L5P Duramax Stage 1 High Flow Intake Bundle Kit

Replace the two weakest links in the charge air path on your 2020-2026 Chevrolet Silverado / GMC Sierra 2500HD/3500HD 6.6L Duramax L5P with the Wehrli Stage 1 High Flow Intake Bundle Kit (Manufacturer Part # WCF100410). Out goes the restricted two-piece 2.5" driver side pipe and the leak-prone plastic and rubber passenger side pipe. In goes a one-piece 3" hot side and a 3.5" cold side in 14 gauge mandrel bent aluminum. Bolt on, no tuning, and SEMA certified emissions compliant.

Why Choose the Wehrli Stage 1 High Flow Intake Bundle Kit?

• SEMA Certified Emissions Compliant – Cert No. SC-WCF01-0176. Not every charge pipe upgrade carries one.
• 2.5" to 3" on the hot side, one piece – the factory pipe is two pieces with a resonator in the middle. Wehrli deletes the resonator and the middle boot joint entirely.
• 3.5" cold side with a billet adapter – CNC machined flange plus a black anodized billet aluminum adapter with a double O-ring seal, in place of the plastic and rubber piece that splits.
• Clip ring gone at the Y-bridge – the OEM clip ring design is replaced with a high quality silicone boot and stainless T-bolt clamps that hold real boost without weeping.
• Keeps the truck stock-compatible – retains every factory connection point and sensor, so nothing gets orphaned.
• 14 gauge mandrel bent aluminum – heavy wall with smooth aerodynamic bends, built in the USA.
• Custom powder coat – finished in your choice of Wehrli's colors.

Kit Includes

• 3" driver (hot) side intercooler pipe, one piece, 14 gauge mandrel bent aluminum
• 3.5" passenger (cold) side intercooler pipe with CNC machined flange
• Black anodized CNC machined billet aluminum adapter with double O-ring seal
• Reinforced silicone boots
• Stainless steel T-bolt clamps
• O-rings
• Intercooler outlet clip

Installation Highlights

Installs with basic hand tools on an otherwise stock truck — no tuning, no other modifications or upgrades necessary. Factory connection points and sensors are retained.

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

• Driver (hot) side pipe: 3" diameter, one piece, resonator and middle boot joint deleted
• Passenger (cold) side pipe: 3.5" diameter with CNC machined flange and double O-ring billet adapter
• Construction: 14 ga. mandrel bent aluminum
• Emissions: SEMA Certified Emissions Compliant, Cert No. SC-WCF01-0176
• Shipping weight: 15.0 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

• SEMA emissions certified - Cert No. SC-WCF01-0176.
• 3" one-piece hot side - OEM resonator and middle joint deleted.
• 3.5" cold side, billet adapter - double O-ring seal replaces plastic and rubber.
• Silicone boot at the Y-bridge - no more clip ring.
• No tuning required - bolt on to a stock truck.
• Custom powder coat finish - pick your color above.

Notes

• Lead time varies by color. WCFab Red, WCFab Grey, Illusion Purple, Candy Teal, Bengal Red, 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.
• Stage 2 for this truck adds the 4" intake and air box on top of these pipes. Call if you would rather do it in one go.

FASS SKU: WCFWCF100410

Manufacturer Part #: WCF100410

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