GMC Medium Duty 6500 Performance Air Intake - Wehrli - High Flow Intake Horn - Flat Black - 2019–2024. This cast-aluminum intake horn replaces the restrictive factory turbo inlet to increase airflow and sharpen throttle response on L5D 6.6L Duramax-equipped trucks.

Engineered by Wehrli Custom Fabrication, the true 4-inch inlet with a smooth anti-surge face mates to the compressor cover using an O-ring seal for reliable fit and optimized drivability. It works with stock or OEM-style drop-in turbos and with OEM or aftermarket cold-air intakes. CNC-machined cast aluminum with a flat black powder coat, a billet #10 ORB PCV port, and included hardware make it a clean bolt-on install—no tuning required. Expect improved airflow versus stock (25% greater area at the inlet; 27% better flow), plus a more pronounced turbo note. Compatible with 2019–2024 GM Medium Duty 4500/5500/6500 L5D 6.6L.

Features

• True 4 in. turbo intake with anti-surge face
• CNC-machined cast aluminum; flat black powder coat
• O-ring seal to turbo; includes mounting hardware
• #10 ORB billet PCV connection
• Works with OEM/aftermarket CAI and drop-in turbos
• Bolt-on install; no tuning required
• Made in the USA

Have questions or planning a build? Call our Austin shop at 512-982-9393 or our Los Angeles area location at 562-981-6800. We offer installation and customization at both locations.

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

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