the EBC has base maps so to speek so if you just plug it in you shouldnt be going over 15 PSI. it might have some spikes if you get on it with out any tuning.

I have the Greddy E01 witch is a little bit more indepth. ie. duty cycle, rpm boost, and a bunch of other stuff.

if the wire is solder'D in or by using the clips. as long as you have a good conection. you are good to go. the soldering is just a more reliable way to do the job.