The WCFab L5P 4 in. High Flow Cast Aluminum Turbo Intake Horn for 2017-2025 Chevrolet Silverado or GMC 2500 / 3500 HD trucks equipped with the 6.6L Duramax Diesel is the largest and highest flowing turbo inlet on the market. Replaces the restrictive OEM plastic turbo mouthpiece to provide increased airflow to your turbocharger for improved engine performance and throttle response. Includes billet aluminum port for PCV system connection. Custom powder coated in the color of your choice. All aluminum construction provides increased durability and more aggressive turbo and engine sound. Made in USA! Pair it with our Stage 1 L5P Cold Air Intake Kits and Stage 1 High Flow Bundle Kits along with emissions compliant performance tuning and drop in performance turbochargers for maximum performance gains. - - Replaces the 12678756 turbo inlet in the following GM Part Numbers: 19432816 and 12682569 - - Supersedes WCFab part numbers: WCF100721 and WCF100833 - - Fitment Note: This product is also compatible with the L5D 6.6L Duramax found in 2019-2024 Medium Duty (4500, 5500, 6500) GM trucks.

Additional Information

Wehrli Custom Fabrication 2017-2025 L5P Duramax High Flow Turbo Intake Horn WCFab Red

Part Type

Turbocharger Inlet Pipe

Features and Benefits

• 25% Greater Flow Area than OEM at Compressor Inlet
• Bolt On Upgrade, No Tuning Required. Works with stock trucks, no other modifications or upgrades necessary!
• CNC Machined Cast Aluminum Construction
• Compatible with stock and OEM-style aftermarket drop in style turbochargers with larger compressor wheels
• Custom Powder Coat Finish
• Flows 27% Better than Stock!
• Includes #10 ORB threaded billet aluminum hose barb for PCV connection
• Includes Mounting Hardware
• Made in USA
• O-Ring Seal at Face of Turbocharger
• True 4" Inlet Turbo Intake with smooth flowing transition to strategically designed anti-surge face which properly engages into turbo compressor cover for optimized airflow and drivability.
• Works with OEM and Aftermarket Cold Air Intake Systems

Product Downloads

#	Document Type	Download
1.	Installation Instructions

Installation guides, warranty details, and other supporting documents are provided by the supplier. In some cases, these files may originate from regions outside your locale, meaning instructions, warranty procedures, and images may not fully align with your specific vehicle or region (e.g., LHD vs. RHD differences, return policies, etc.). If you need clarification, please contact a StreetFX support agent.

• 25% Greater Flow Area than OEM at Compressor Inlet
• Bolt On Upgrade, No Tuning Required. Works with stock trucks, no other modifications or upgrades necessary!
• CNC Machined Cast Aluminum Construction
• Compatible with stock and OEM-style aftermarket drop in style turbochargers with larger compressor wheels
• Custom Powder Coat Finish
• Flows 27% Better than Stock!
• Includes #10 ORB threaded billet aluminum hose barb for PCV connection
• Includes Mounting Hardware
• Made in USA
• O-Ring Seal at Face of Turbocharger
• True 4" Inlet Turbo Intake with smooth flowing transition to strategically designed anti-surge face which properly engages into turbo compressor cover for optimized airflow and drivability.
• Works with OEM and Aftermarket Cold Air Intake Systems

Please note that this information serves as a fitment guide only. For specific fitment questions or clarifications, please contact us, as manufacturers may introduce variations and modifications during model year or regional revisions. While we strive to provide accurate data, fitment details may vary by region; therefore, compatibility outside the listed region and submodel variant cannot be guaranteed.