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The Wehrli 3.5" intake horn for 2020–2024 Chevrolet 6.6L L5P Duramax swaps the factory 2.4" plastic horn for a larger 3.5" intake area to improve airflow to the turbo and includes a provision for the OEM PCV line. Wehrli reports a 25HP gain when used with a Max Effort tune; the horn fits stock trucks without other modifications, is powder-coated for durability, includes mounting studs and O-ring, and is bolt-on with no tuning required.
Wehrli 20-24 Chevrolet 6.6L L5P Duramax 3.5in Intake Horn w/PCV Port - Gloss White
