Can the stock 4AGE ECU work with my turbo conversion?
The stock ECU on a 4AGE will not properly control the fuel needs for a boosted application. An add-on piggyback ECU or a stand-alone ECU should be considered a necessity for any turbo conversion. HKS originally offered their PFC-FCon piggyback unit for use on the 4AGE. There were two different EPROMs used with it: one for the stock injectors and another for the larger injectors.
