Its all plug and play, from what i have been told and such AEM is a VERY easy straight foward plug and play install.
You will be fine.
I too will be running AEM EMS, but it will be the last thing i purchase in a few weeks since its one of the last things to be installed.
However, i will be using an Apexi-AVCR for my boost control, i have been told that it can be a pain to manage boost with AEM.
But my setup looks similar.
AEM 30-1300 box, 3.5bar map kit, their IAT kit, and 1000cc injectors, 255 walbro, aero FPR, and stock lines/rail, i will also be using their meth kit.

For going with AEM.