It looks like the STB would fit the '45 just fine. Gotta get me one of those.
I've known the other stuff was coming for a while; still be nice to know when and how much.
As for that piggy-back unit, it looks to be the SMT6 Perfect Power unit or Stillen's version of it, anyway. Do a search on My350Z.com and you can find a bit more info. Piggy-backs are more convenient than an ECM flash, but they can't do as much (such as raise the redline and remove top speed limiter).
There are many other mods besides the strut bar.
Strut bar is appealing because most of the time it is cheap, nice engine visual enhancement, and ease of install.
From the catalog pic the stillen strut bar doesn't seem that special. If they charge more than 180 for it its going to be a major rippoff (unlessits made of Ti)