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Part Brand: Wehrli
Part Number: WCF100775-GB
Upgrade your 2017-2024 GM 6.6 L L5P Duramax with the Wehrli WCF100775-GB 4" High-Flow Turbo Intake Horn. This cast-aluminum piece enhances airflow, boosts throttle response, and offers a sleek gloss black finish.
Easy bolt-on installation with included hardware, no tuning required. Durable, reliable, and ready for performance.
Vehicle Fitment
- 2017–2024 Chevrolet Silverado 2500 / 3500 HD (6.6 L L5P Duramax)
- 2017–2024 GMC Sierra 2500 / 3500 HD (6.6 L L5P Duramax)
Features
- True 4″ cast-aluminum intake horn for maximum airflow
- Replaces restrictive OEM plastic turbo inlet
- Includes billet aluminum PCV port for crankcase ventilation
- O-ring seal for reliable, boost-resistant connection
- No tuning required — bolt-on upgrade
- Stainless steel mounting hardware included
- Custom powder-coat finish in **Gloss Black** (‑GB variant)
- Durable all-aluminum construction for strength and heat resistance
Specifications
- Material: Cast aluminum
- Inlet size: 4.00″
- Seal: O-ring at turbo face
- Finish: Gloss Black powder coat
- PCV fitting: Billet aluminum
- Weight: Approximately 3.6 lb
Included Components
- 1× 4″ intake horn
- 1× O-ring seal
- 1× Billet aluminum PCV barb
- Mounting hardware (bolts, washers)
Product Description
The **Wehrli WCF100775‑GB** is a high-performance turbo intake horn made for the 6.6 L L5P Duramax in 2017–2024 GM HD trucks. Designed to replace the stock plastic inlet, its 4″ cast-aluminum construction significantly improves airflow to the turbo, boosting spool-up, throttle response, and overall performance.
Built for durability, this horn features a billet-PCV port so you can maintain proper crankcase ventilation. The O-ring seal ensures a tight connection at the turbo compressor face with no boost leaks. With its gloss black finish, this variant adds a sleek, stealthy look under the hood.
Installation is simple — it’s a bolt-on part that doesn’t require tuning for stock or moderately tuned setups. Made in the U.S., the WCF100775‑GB is a great upgrade for anyone wanting a reliable, high-flow intake solution with style and substance.
*Parts are for USA spec vehicles, please contact us to verify fitment on JDM & international models.
· · · SHIPPING · · ·
- Free shipping across the contiguous 48 United States (excludes Hawaii and Alaska). Item(s) ships on the same day or within 1 business day. Delivery time is within 2 to 4 business days excluding next day deliveries. Orders over $750 require signature for delivery.
- Canada customers - If does not collect import & duty fees during checkout, the shipping carrier will collect them prior to delivery.
· · · RETURNS · · ·
Your complete shopping satisfaction is our #1 priority. If an item you ordered from us does not meet your expectations, please contact us within 30 days of receiving the item(s). If your order arrives damaged from shipping please contact us and we will provide a prepaid return label to send back for a replacement or refund.
- Returned items must be in the original packaging (including plastic wrapped items) and in brand new condition.
- Any returns received installed, mounted, used or missing components will be subject to return fee's.
· · · PAYMENTS · · ·
- We accept all payment methods through 's payment system
- PayPal, and all major credit cards/debit cards are accepted.
· · · response · · ·
- Customer satisfaction is a top priority for us. If you have any issues with your order, please let us know. We will make every effort to resolve any problems and ensure you are satisfied.
· · · CONTACT US · · ·
- We appreciate your business. If you have any questions, please message us through and we will respond within 24 hours on weekdays. Feel free to browse our store for other available items. Thank you again for choosing to shop with us!
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