[longassname]

You need the electrical plugs for the injectors. They are available on ebay as well. I think they are $70 for a set of 6. They come with wires in them but rather than cut your wires you can just pop them out of the connectors and swap just the plastic connectors.

As for when to make the jump to stage 2v7 over stage2v5...I think I'll leave that kind of discussion and decision making to you guys.