Our Subaru Impreza New Age Decat Pipe removes the catalytic converter and replaces the pipe with a high flow, stainless steel 2.5" bore item. Features: Manufactured from T304 stainless steel 2.5" bore TIG welded, CNC machined flanges Compatible with standard or aftermarket back box Fits: Subaru Impreza GDA 2001-2005 WRX & STi models.