Ive made mine and installed it, but havent tuned it yet.
It was all pretty easy, you just have to be careful.
Get the DFA and dont waste ur money on a SAFC for 3 times the price. It does exactly the same thing.
Emanage is a bit different because it has other bits you can add on eg. ignition timing.
All instructions and photos are in the Silicon Chip book Performance Electronics for Cars. Get the book and have a read, its all good.
Note that if you have an r32 you will have to get a r33 boost solendoid, which'll cost an extra few bucks ($40 maybe)