Our Subaru Impreza New Age Decat Downpipe replaces the standard restrictive downpipe and catalytic converters with a stainless steel, one-piece item. Increasing the bore of the downpipe and replacing the restrictive catalytic converters allows the exhaust gasses to flow much more freely, increasing the power output of the engine. Features: Manufactured from T304 stainless steel 3" bore with 2.5" outlet TIG welded, CNC machined flanges Boss fitted to accept O2 (lambda) sensors Gaskets included Fitment: Subaru Impreza New Age (2001-2006) models. Please note: sold for off-road/track use only. This item may not comply with your local emissions regulations. This item will not fit estate (wagon) models.