I plan on using this ECM in a twin turbo small block application.
I am looking for info from anyone with experience with Proms that work well with a two bar map sensor and this computer. I will use 50/55 lb injectors and wonder if I need Low impedence or can do with high impendence injectors and still get decent idle qualities in a street engine.

 

You really should check out both the Power Adder and DIY PROM fora. There are several boosted ThirdGens with contributing members that haunt those places.