Gravity Performance decats instantly increase power by allowing exhaust gasses to exit the vehicle quicker. Our decats are designed to be direct replacements for the OEM catalytic converter, ensuring smooth installation every time. ---Manufactured from highest quality T304 grade stainless steel ---Free flowing to get the most from the EJ20 and EJ25 boxer engine ---Large bellmout inlet, designed to maximise exhaust flow ---Noticeably improves throttle response ---Sold for off road and track use only Fitment ---Subaru Impreza Bugeye WRX STi 2002-2003 models ---Subaru Impreza Blobeye WRX STi 2004-2005 models ---Subaru Impreza Hawkeye WRX STi 2006-2007 models Please Note: This will not fit the Spec C twin scroll models.