Spec-D Tuning HH2-WRX02-DK Subaru Impreza WRX 2.0/2.5L DOHC Engine S/S Manifold Exhaust Header+Up Pipe Fits 2002-2007 Subaru Impreza WRX / WRX STI 2.0L/2.5L DOHC engine models only Made of high quality T-201 stainless steel 4-1 light weight racing desig Inlet: 1.5" / Outlet: 2.0" Comes with 02 sensor insertion & metal gasket