For Subaru Impreza WRX/Legacy/Outback/Forester Stainless Steel Turbo Exhaust Downpipe Made of High Quality T-304 Stainless Steel with Computerized Mandrel-Bends i.e. Maximizing Smoothest Exhaust Airflow TIG Welded CNC Machine Flange for Strength and Durability Race-Inspired Straight-Thru Design Piping for Maximum Air Flow Improve Overall Performance, Increase Horsepower and Torque, Dyno Proven to Instantly Increases 10 -20 Horsepower/ Low End Torque Inlet: 3"/ Outlet: 3" / 10mm Thickness Flange to Turbo