Wehrli 2020-2026 L5P Duramax 3.5" Passenger (Cold) Side Intercooler Pipe 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 factory cold side pipe on a 2020-2026 Chevrolet Silverado / GMC Sierra 2500HD/3500HD 6.6L Duramax L5P is a restricted rubber and plastic design, and it is where boost leaks start. The Wehrli 3.5" High Flow Passenger (Cold) Side Intercooler Pipe Kit (Manufacturer Part # WCF100381) replaces it with a one-piece 14 gauge aluminum pipe sealed at both ends with double O-rings.
Why Choose the Wehrli Cold Side Intercooler Pipe Kit?
- One piece aluminum – replaces the OEM rubber and plastic assembly with a full 3.5" mandrel bent pipe.
- Double O-ring seal at both ends – a black anodized CNC machined billet adapter at the upper connection and a CNC machined flange at the intercooler, each with double O-rings.
- Upgraded silicone boot and stainless T-bolt clamps – better pressure and temperature resistance than the factory design.
- Fewer blown boots, fewer boost leaks – which is the point on a tuned or worked truck.
- 14 gauge aluminum – heavy wall construction, made in the USA.
- No tuning required – bolt on to a stock truck.
Kit Includes
- 3.5" passenger (cold) side intercooler pipe, one piece, 14 gauge aluminum
- Black anodized CNC machined billet aluminum adapter with double O-ring seal
- CNC machined flange with double O-ring seal at the intercooler connection
- Upgraded silicone boot
- Stainless steel T-bolt clamps
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
- Pipe: 3.5" diameter, one piece, 14 ga. aluminum
- Upper connection: black anodized CNC machined billet adapter, double O-ring
- Intercooler connection: CNC machined flange, double O-ring
- Shipping weight: 8.0 lbs
- Package dimensions: 24" W x 6" H x 10" L
- Finish: custom powder coat, color selected above
- Made in the USA
Key Features at a Glance
- One-piece 3.5" aluminum - replaces OEM rubber and plastic.
- Double O-ring seals at both ends - billet adapter and machined flange.
- Upgraded boot and T-bolt clamps - holds real boost.
- 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 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 matching 3" driver (hot) side pipe is a separate part. Wehrli's Stage 1 bundle covers both sides in one kit.
FASS SKU: WCFWCF100381
Manufacturer Part #: WCF100381
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
This part fits the following vehicles:
| Years | Make & Model |
|---|---|
| 2020–2024 | Chevrolet Silverado 2500 HD |
| 2020–2024 | Chevrolet Silverado 3500 HD |
| 2020–2024 | GMC Sierra 2500 HD |
| 2020–2024 | GMC Sierra 3500 HD |
| 2024–2026 | Chevrolet Silverado 2500 |
| 2024–2026 | Chevrolet Silverado 3500 |
| 2024–2026 | GMC Sierra 2500 |
| 2025–2026 | GMC Sierra 3500 |
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.
