For Subaru Impreza WRX Turbo 2.5" Up-Pipe w/Flex Made of high quality T-304 stainless steel with computerized mandrel-bends TIG welded CNC machine flange for strength and durability Increase engine output and efficiency / Gain 10 to 15 horsepowers Inlet: 2" / Outlet: 2.375" Application: 02-07 Subaru Impreza WRX AWD Turbo