3.5 in. Turbo Intake Horn for the 2020-2024 L5P Duramax with factory style Turbo. The OEM plastic intake horn is 2.4 in. diameter and we experienced a 25HP Gain with our 3.5 in. Horn when used with a Max Effort Tune. Tuning not required, this horn will work plug and play tuners or OEM calibration. Additional Attributes: GTIN: Material: Steel Mounting Hardware Included: Yes Gasket Or Seal Included: Yes Finish: Powder Coated Prop 65 Y/N: Y Extended Information: Emissions : EPA Eligible Life Cycle Status: Available To Order Packaging: Quantity of Each: 1 Package UOM: EA Dimension: 14 x 14 x 10 inches Weight: 6 PG PDF: l5p-20-21-intake-horn_wcf100833