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Thumbnail Filmstrip of 2017–2024 GM Silverado/Sierra 6.6L L5P Duramax Fleece High-Flow Intake Horn FPE-L5P-INTAKEHORN Images
Engineered specifically for 2017 through 2024 Chevrolet Silverado and GMC Sierra 2500HD/3500HD trucks powered by the 6.6L L5P Duramax diesel engine, the Fleece Performance High-Flow Intake Horn (Part # FPE-L5P-INTAKEHORN) replaces the narrow, restrictive factory plastic molded stock inlet (2.4" diameter) with a much larger 3.3-inch cast aluminum runner.
This simple direct-replacement upgrade increases turbo airflow efficiency to deliver gains of up to 10 rear-wheel horsepower (RWHP) with zero custom tuning required. The kit includes a square-cut O-ring, a billet aluminum PCV fitting, and all necessary mounting hardware.
Key Features & Benefits
- Increased Airflow Capacity: Replaces the restrictive 2.4-inch factory plastic runner with a high-flow 3.3-inch cast aluminum inlet.
- Horsepower Gains: Proven to unlock up to 10 additional rear-wheel horsepower (RWHP) without modifications or tuning.
- Durable Cast Aluminum Construction: Eliminates the risk of cracking or distortion common with factory plastic inlet horns under high boost.
- Complete Hardware Kit: Includes a square-cut O-ring, billet aluminum PCV fitting, and M8x1.25 mounting fasteners for a seamless install.
- No Tuning Required: Direct bolt-on installation integrates seamlessly with factory emissions and intake plumbing.
Technical Specifications
- Manufacturer / Brand: Fleece Performance Engineering
- Manufacturer Part Number / SKU: FPE-L5P-INTAKEHORN
- Product Type: Upgraded High-Flow Intake Horn / Turbo Inlet Runner
- Material / Construction: Durable Cast Aluminum with Billet PCV Fitting
- Stock vs. Upgraded Diameter: 2.4-Inch (Stock Plastic) to 3.3-Inch (Fleece Cast Aluminum)
- Truck Compatibility: 2017–2024 GM Silverado / Sierra 2500HD / 3500HD Duramax
- Engine Platform: 6.6L L5P V8 Turbo Diesel
- Core Requirement: None
- Warranty: Fleece Performance Limited Warranty
Vehicle Fitment & Technical Installation Notes
- 2017–2024 GM 6.6L L5P Duramax (Silverado & Sierra 2500HD/3500HD)
- Installation Tip: Carefully clear all debris from the turbo inlet opening before dropping the new O-ring and bolting down the aluminum horn. Removing the upper intake pipe sections provides necessary clearance.
Engineered specifically for 2017 through 2024 Chevrolet Silverado and GMC Sierra 2500HD/3500HD trucks powered by the 6.6L L5P Duramax diesel engine, the Fleece Performance High-Flow Intake Horn (Part # FPE-L5P-INTAKEHORN) replaces the narrow, restrictive factory plastic molded stock inlet (2.4" diameter) with a much larger 3.3-inch cast aluminum runner.
This simple direct-replacement upgrade increases turbo airflow efficiency to deliver gains of up to 10 rear-wheel horsepower (RWHP) with zero custom tuning required. The kit includes a square-cut O-ring, a billet aluminum PCV fitting, and all necessary mounting hardware.
Key Features & Benefits
Increased Airflow Capacity: Replaces the restrictive 2.4-inch factory plastic runner with a high-flow 3.3-inch cast aluminum inlet.
Horsepower Gains: Proven to unlock up to 10 additional rear-wheel horsepower (RWHP) without modifications or tuning.
Durable Cast Aluminum Construction: Eliminates the risk of cracking or distortion common with factory plastic inlet horns under high boost.
Complete Hardware Kit: Includes a square-cut O-ring, billet aluminum PCV fitting, and M8x1.25 mounting fasten[...]
Engineered specifically for 2017 through 2024 Chevrolet Silverado and GMC Sierra 2500HD/3500HD trucks powered by the 6.6L L5P Duramax diesel engine, the Fleece Performance High-Flow Intake Horn (Part # FPE-L5P-INTAKEHORN) replaces the narrow, restrictive factory plastic molded stock inlet (2.4" diameter) with a much larger 3.3-inch cast aluminum runner.
This simple direct-replacement upgrade increases turbo airflow efficiency to deliver gains of up to 10 rear-wheel horsepower (RWHP) with zero custom tuning required. The kit includes a square-cut O-ring, a billet aluminum PCV fitting, and all necessary mounting hardware.
Key Features & Benefits
- Increased Airflow Capacity: Replaces the restrictive 2.4-inch factory plastic runner with a high-flow 3.3-inch cast aluminum inlet.
- Horsepower Gains: Proven to unlock up to 10 additional rear-wheel horsepower (RWHP) without modifications or tuning.
- Durable Cast Aluminum Construction: Eliminates the risk of cracking or distortion common with factory plastic inlet horns under high boost.
- Complete Hardware Kit: Includes a square-cut O-ring, billet aluminum PCV fitting, and M8x1.25 mounting fasteners for a seamless install.
- No Tuning Required: Direct bolt-on installation integrates seamlessly with factory emissions and intake plumbing.
Technical Specifications
- Manufacturer / Brand: Fleece Performance Engineering
- Manufacturer Part Number / SKU: FPE-L5P-INTAKEHORN
- Product Type: Upgraded High-Flow Intake Horn / Turbo Inlet Runner
- Material / Construction: Durable Cast Aluminum with Billet PCV Fitting
- Stock vs. Upgraded Diameter: 2.4-Inch (Stock Plastic) to 3.3-Inch (Fleece Cast Aluminum)
- Truck Compatibility: 2017–2024 GM Silverado / Sierra 2500HD / 3500HD Duramax
- Engine Platform: 6.6L L5P V8 Turbo Diesel
- Core Requirement: None
- Warranty: Fleece Performance Limited Warranty
Vehicle Fitment & Technical Installation Notes
- 2017–2024 GM 6.6L L5P Duramax (Silverado & Sierra 2500HD/3500HD)
- Installation Tip: Carefully clear all debris from the turbo inlet opening before dropping the new O-ring and bolting down the aluminum horn. Removing the upper intake pipe sections provides necessary clearance.