Nostrum V2 Stage 1 Direct Injection DI Injectors***Newly revised with a new part number. The same great performance you have come to expect from Nostrum, now with faster closing times!*** These injectors have been carefully developed to fit like factory and have no compatibility issues with a stock WRX FA20F engine, meaning theres no need to worry about secondary injection controllers, fitting secondary injector hardware, filling meth tanks, or clogged meth injectors. Being that they are compatible