cbileske wrote:I was actually looking into the Engine Manegment system, what is the difference in the two?
This is not a standalone, and therefore doesn't have full ignition control (only a timing retard function) or UEGO wideband support, or boost controller support.
The o2 and boost controller support is really small potatoes compared to the timing issue though... stock ECU's can advance timing in weird places and at weird times (mostly for emissions control reasons), and when you're boosting an NA car this especially becomes a problem.
The timing retard feature can help, but for factory turbo engines (like the RB, or SR) a lot of power is made from playing with timing - not being able to advance past factory settings is always troublesome.
If you're cheap, get this instead of an S-AFC. Don't get it in lieu of a standalone.