The BD L5P intake horn replaces the plastic factory turbo inlet pipe. The pipe is manufactured from 3-1/2" 409 series stainless tubing and features black powder coating for extra protection. The BD intake horn is a drop-in an upgrade component that compliments the L5P Screamer Turbo and other aftermarket upgraded turbos for the L5P! Not recommend for use on OE turbochargers unless custom tuning is accompanied.