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Originally Posted by murphy
you could try it..but stock ecu's can't compensate for higher flow injectors and you will run richer than you wish to. or you cold just try the pump and see how it goes. The pump will help a little. its also in what goals you have. you could also do the fuel delivery mod. that they use on the 2.5 rs to the #3 cyl. gets enough fuel.
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I thought the stock O2 sensor took care of that. Basically the larger injectors add more fule at a certain duty cycle, so the car runs rich, the O2 sensor sees this and tells the ECU to reduce fueling, so the duty cycle goes down.
Perhaps that's only something that's done with a remap of the ECU. All I know is, I wouldn't bother with a piggy-back AFC when you can reprogram the ECU to do it. The ECUs in Subarus are powerful computers! Use them to your advantage!