Our Impreza Newage Sports Cat Downpipe replaces the standard restrictive downpipe and catalytic converter with a stainless steel, 3" one-piece item with a built-in sports cat. Increasing the bore of the downpipe and replacing the restrictive catalytic converter allows the exhaust gasses to flow much more freely, increasing the power output of the engine. Features: Manufactured from high-strength T304 stainless steel Free flowing 3" bore improves power & torque Built-in non type approved 200cpi sports cat Fully TIG welded with CNC machined flanges Effective upgrade to get the most out of the boxer engine Fitment: Subaru Impreza GDA NewAge WRX STI 2002-2007 models Please note: This is a non type approved CAT and as such will not pass an MOT so is sold for off road/track use only.