---Manufactured from highest quality T304 grade stainless steel ---Replaces the Catalytic converter on WRX models only ---Free flowing to get the most from the EJ20 engines ---Designed to improve power and torque across the entire RPM range ---Sold for off road and track use only (WRX models) Fitment: ---Subaru Impreza Classic and Newage 1993-2005 models incl. WRX STI ---Subaru Impreza GC8 & GDA/GDB 1992-2005 all turbo models.