Radium Fuel Hanger (Pumps Not Included)
The Fuel Hanger For Walbro F90000267/274/285 is available for those who want to increase the fuel volume and delivery on the Subaru WRX.
IAG PTFE Fuel System Kit w/ Injectors, Lines, FPR, Fuel Rails
The PTFE Fuel System Kit will include the 2600cc Fuel Injectors to increase the fuel supply.
As far as the rest of your questions I'm not sure.