Perrin PSP-INT-430BK Black Turbo Intake Inlet Hose Pipe for 2013-15 Scion FR-S / Subaru BRZ Smoothest air path for ZN6 : Adds color the engine bay : 3 Inch diameter The OEM inlet hose will quickly become your biggest restriction when adding bolt ons parts like intake and exhaust components or when doing major upgrades such as performance camshafts or engine internals. The PERRIN inlet hose will let you maximize all your performance power upgrades. This allows for a greater amount of air to smoothly enter your engine with virtually no restriction. This also cleans up the engine bay be removing all the added hoses for these two things.