Wehrli WCF100775-GB 4" High-Flow Turbo Intake Horn for 2017-24 GM 6.6 L L5P

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

• 1x 4" intake horn
• 1x O-ring seal
• 1x 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.