GMC 3500 HD Performance Air Intake – Wehrli High Flow Intake Horn – Sparkle Copper – 2017–2025. A true 4-inch cast-aluminum turbo inlet for the 6.6L Duramax L5P, designed to improve airflow and response.

This horn replaces the restrictive OEM plastic mouthpiece with a CNC-machined cast body featuring a smooth transition and an anti-surge face that keys into the compressor cover. An O-ring seal, #10 ORB billet PCV port, and included hardware simplify installation. Works on stock trucks with no tuning, and with OEM or drop-in turbos and most cold air intake systems. Made in the USA with a durable Sparkle Copper finish. Fits 2017–2025 GM 2500/3500 HD L5P and 2019–2024 Medium Duty L5D. Provides 25% greater flow area at the compressor inlet and flows 27% better than stock. Replaces GM 12678756 (19432816, 12682569).

Features

• True 4 in. turbo intake with smooth transition and anti-surge face
• CNC machined cast aluminum with O-ring seal at turbo face
• #10 ORB billet hose barb for PCV connection
• Bolt-on upgrade; no tuning required; includes hardware
• Works with OEM and aftermarket cold air intake systems
• Compatible with stock and OEM-style drop-in turbos
• Custom Sparkle Copper powder coat; Made in USA

Have questions or planning a build? Call us at 512-982-9393 (TX) or 562-981-6800 (CA). We have locations in Austin, Texas and the Los Angeles, California area offering installation and customization services.

Buying multiple items? Contact us for shipping discounts. We install on premises at both locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov