These flow diagrams are to assist with the installation of the Agency Power GDA-120, GDBC-120 and GRB-120 Subaru WRX STI Fuel rails kits.   Agency Power Fuel Rail Kit Subaru WRX 02-11 STI 2007  (AP-GDA-120) and (AP-GDBC-120) Subaru STI 2004-2006 Agency Power Fuel Rail Kit Subaru STI 2008-2016 (AP-GRB-120)