Korsh Catted Down pipe suit Subaru WRX STI 01-07Premium catted downpipe engineered specifically for Subaru WRX STI models from 2001 to 2007. This high performance exhaust component delivers improved flow characteristics while maintaining emissions compliance with its integrated catalytic converter. Key Features: Direct bolt on fitment for 01 07 WRX STI Cast Head for improved flow High flow 200 Cell catalytic converter design Precision engineered mandrel bends for optimal exhaust flow Durable