The V4 on my clio is done like that, I chopped up an old ECU for the plug then used the standard loom, could drive it on either when I first did it until I fitted the bodies.

This is how much power difference it made in my case after I put it on the Mtech and mapped it:



Not bad for an instalation that took only a couple of hours and only an hour or so of mapping.

Mine had a particularly crap map in the standard ecu though, was making less power than standard should be, so you probably wont see those sort of gains from management alone, but my point is just that the mtech is very capable for your application