I have an AEM fuel rail and i havent noticed my gas mileage really go down any. If i get injectors, new pump, and a pressure regulator, is it really gonna negatively affect my gas mileage?

 

depending on the can your goin to need a way to control the injectors which would be a VAFC 2, if you jus dropped in a new set of injectors no matter how big, the ecu would treat them as stock injectors and wouldnt do anything for you.

as for the pump and reg., you wouldnt need them unless you are makeing over 300 whp then it would be a good idea to change them out,

as a matter of fact ive seen mags where a 670 WHP integra has the stock FPR still.

 

Alright, so other than my fuel rail, should i leave my fuel system alone? Would injector make that big of a difference?

And what about the gas mileage? [&:]