the greddy ultimate emanage is almost out, they are taking orders already, and I must say its pretty damn impressive. Its like a hybrid piggyback/standalone. You can check out its features here on mohdparts.com or this link is the features page.
http://www.mohdparts.com/emana....html
a good thing to note is that unlike all other AFC's this now trim and adds fuel directly throught he injectors so it does not effect the maf signal which inturn doesnt cause timing changes which is a problem all AFC's have. (regular emanage can only add fuel so when you resize injectors if fuks up your timing maps)
Quote from greddy: Fuel trimming in the previous system was achieved by adjusting the “Airflow Adjustment Map” which could also affect the ignition timing. The improved “Injection Adjustment Map” is used to trim and add fuel directly by controlling the injector signal, therefore it will not affect the ignition timing at all.
Its also got a ton of other features, pretty cool if you are into tuning on your own and dont want to go the standalone/tuned rom method.
EDIT: look at this feature
By inputting target Air Fuel values in this map, “e-mange Ultimate” will automatically make corrections to the “Injection Map,” if an A/F meter (wideband) is connected to the Auxiliary Output signal. This feature can shorten the tuning time.