WCFab 4 in. High Flow Cast Aluminum Turbo Intake Horn - Gloss Black - Select Chevrolet/GMC 2017-2025 (6.6L)

Fits select 2017-2025 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD trucks, plus 2019-2024 4500/5500/6500 Medium Duty models (6.6L Duramax L5P / L5D).

Eliminate the airflow bottleneck in your Duramax engine with the WCFab High Flow Cast Aluminum Turbo Intake Horn. This true 4-inch diameter inlet replaces the restrictive factory plastic mouthpiece, delivering a 25% increase in flow area at the compressor inlet and a 27% improvement in total airflow over the stock component. Engineered with a smooth-flowing transition and a strategically designed anti-surge face, this intake horn optimizes airflow and drivability while providing a more aggressive engine and turbo sound.

Constructed from CNC-machined cast aluminum for superior durability, this is a direct bolt-on upgrade that requires no aftermarket tuning. It features an O-ring seal at the turbocharger face for a leak-free fit and includes a #10 ORB threaded billet aluminum hose barb for a secure PCV system connection. This intake horn is compatible with both OEM and aftermarket cold air intake systems and works with stock or drop-in style performance turbochargers.

• True 4" CNC machined cast aluminum construction
• Flows 27% better than the factory mouthpiece
• Anti-surge face design for optimized compressor engagement
• Includes #10 ORB billet aluminum PCV hose barb and mounting hardware
• Durable gloss black powder coat finish
• No tuning or additional modifications required
• Replaces OE part number: 12678756 (GM Part Numbers 19432816, 12682569)
• Supersedes WCFab part numbers: WCF100721, WCF100833
• Manufacturer Part Number: WCF100775-GB
• Made in the USA