Wehrli 2011-2016 Duramax LML Stage 1 High Flow Intake 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 WCFab Stage 1 upgrade for the 2011-2016 LML 6.6L Duramax Diesel Chevrolet Silverado or GMC Sierra 2500 / 3500 HD truck improves airflow between the turbo and engine for improved efficiency, throttle response, and turbo spool-up. This kit eliminates weak points in the factory design that can lead to boost leaks or complete failures in hard-working and high performance trucks.
The 3" High Flow Driver (Hot) Side Intercooler Pipe replaces the factory two-piece 2.5” pipe with a high flow 3" pipe. The 3.5" High Flow Passenger (Cold) Side Intercooler Pipe replaces the factory plastic two-piece pipe with a high flow, 14 ga. aluminum one-piece 3.5" pipe. Includes upgraded silicone boots to withstand higher boost pressures than the factory components to increase reliability and eliminate blown factory boots and horsepower-robbing boost leaks.
This LML Y-Bridge Kit replaces the OEM upper intake manifold supplying air to the engine intake runners and cylinder heads. The OEM Y-bridge for these trucks is a restrictive part that creates a bottle neck in the air intake tract and limits engine performance potential. This kit includes our high flow, precision CNC machined, cast aluminum intake bridge (40% more airflow than stock) together with a unique, 20% larger than stock, 3" fabricated aluminum upper crossover intercooler pipe that allows you to take full advantage of the larger inlet diameter of our Y-Bridge. The combination improves total air flow by 33% over the stock setup providing maximum airflow volume for the available space.
This means you get the most out of your engine in terms of performance and efficiency. Incorporates factory intake air heater grid for superior cold weather performance. Billet resonator plate eliminates the stock plastic resonator for improved engine bay appearance and more aggressive turbo and engine sound. Compatible with OEM throttle valve and EGR controls.
Finished in your choice of custom powder colors. This product is compatible with stock trucks requiring no additional modifications, upgrades, or tuning for installation. Pairs best with emissions-compliant tuning and drop-in turbochargers for optimum performance gains.
- 3 in. Driver (Hot) Side Intercooler Pipe (18% Gain in Air Flow Over Stock)
- High Flow, Precision CNC machined, Cast Aluminum Y-Bridge (33% Gain in Air Flow Over Stock)
- 3 in. High Flow Upper Intercooler Cross Over Pipe
- 14g mandrel bent aluminum construction
- Incorporated threaded bung to reinstall OEM Intake Temperature Sensor
- Silicone Boots
- T-Bolt Clamps
- Includes Billet Turbo Resonator Plate for OEM Intake Horn
- Connects to factory throttle valve, grid heater, EGR and stock intake runners
- NO Tuning required, bolt on!
- Will fit on stock truck no other modifications or upgrades necessary!
- Durable Custom Powder Coat Finish
- Saves money vs. purchasing parts individually
- Made in USA
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.
