Originally Posted by
Mugenfreak
the apexi safc is a fmu
What are you talking about??
That is a FMU. It increases fuel pressure at the rail, based on PSI from the turbocharger. Similar to how a wastegate works.
More info:
http://neptune.spacebears.com/cars/stories/scfmu.html
In a very limited fashion, the Apexi AFC alters your injector pulse, and fuel curve.