3 1/2″ Turbo Intake Horn for the 2017+ L5P Duramax with factory style Turbo. The OEM plastic intake horn is 2.4″ diameter and we experienced a 25HP Gain with our 3.5″ Horn when used with a Max Effort Tune. Kit Includes PCV Hose and fitting to reroute the PCV to atmosphere.
***Custom Tuning is required with this horn***
***Not compatible on stock tune trucks, or with plug in style tuners (Banks, Stealth, AFE, etc)***