The BD L5P intake horn replaces the plastic restrictive factory turbo inlet pipe and allows greater air flow for increased performance. The pipe is manufactured from 3-1/2” 409 series stainless tubing and features black powder coating for extra protection and performance appearance. The BD intake horn is a drop-in component that compliments upgraded larger turbos like the BD Diesel L5P Screamer Turbo! Turbo Intake Horn; 409 Stainless Steel; Black Powder Coat;