Wehrli 2011-2016 LML Duramax Passenger Side Upper Crossover 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 upper crossover pipe on a 2011-2016 Chevrolet Silverado / GMC Sierra 2500HD/3500HD 6.6L Duramax LML is undersized and carries a resonator. The Wehrli 3" High Flow Passenger Side Upper Crossover Intercooler Pipe Kit (Manufacturer Part # WCF100328) is 20% larger than the OEM part and flows 18% better, with the resonator deleted and a billet block-off plate in the box.
Why Choose the Wehrli Upper Crossover Intercooler Pipe Kit?
- 20% larger than OEM, 18% more airflow – both figures are Wehrli's own: the pipe is bigger, and the flow bench backs it up.
- Resonator deleted – cleans up the engine bay and lets the turbo and engine make more noise under load.
- Billet turbo resonator plate included – the block-off for the OEM resonator port ships with the kit, so there is nothing else to buy.
- Keeps your factory Y-bridge – designed for the OEM bridge and connects to the factory throttle valve and grid heater, so the rest of the system stays put.
- 14 gauge aluminum – heavy wall construction, made in the USA.
- No tuning, no modifications – fits a stock truck and installs with basic hand tools.
- Custom powder coat – finished in your choice of Wehrli's colors.
Kit Includes
- 3" high flow upper intercooler crossover pipe, 14 gauge aluminum
- Billet turbo resonator block-off plate
- Boots, clamps and installation hardware
Installation Highlights
Installs easily with basic hand tools on an otherwise stock truck — no additional modifications, upgrades or tuning required. Connects to the factory throttle valve and grid heater and uses the OEM Y-bridge.
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
- Pipe diameter: 3", 20% larger than the OEM crossover
- Airflow: 18% gain over stock, per Wehrli
- Construction: 14 ga. aluminum
- Compatible with the OEM Y-bridge
- Replaces GM part number: 12642321
- Finish: custom powder coat, color selected above
- Made in the USA
Key Features at a Glance
- 3" pipe, 20% larger than OEM - 18% more airflow.
- Resonator deleted - block-off plate included.
- Works with the factory Y-bridge - no bridge required.
- 14 ga. aluminum - heavy wall, made in USA.
- 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 and Gloss Black with the standard brushed tag are stocked and ship in 3-5 business days. All other colors are made to order on a 10-15 business day lead time.
- Pairs best with emissions-compliant tuning and a drop-in turbocharger if you are chasing the full gain.
FASS SKU: [ADD FASS SKU]
Manufacturer Part #: WCF100328
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
This part fits the following vehicles:
| Years | Make & Model |
|---|---|
| 2011, 2016 | Chevrolet Silverado 2500 HD |
| 2011, 2016 | Chevrolet Silverado 3500 HD |
| 2011, 2016 | GMC Sierra 2500 HD |
| 2011, 2016 | 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.
