Yesterday I received, after purchasing of course, a Tanabe Sustec 4-Point Under Brace. This brace bolts to the same place, on the suspension, that a lower tie bar bolts and to the body where those weird triangular pieces of metal are near the front wheels.
This product is, apparently, a fairly new product for the B15 chassis. It has been verified to fit on all 1.8l B15s and 2.5l B15s. They are also going to check and see if it fits on all 2.0l B15s. My presumption is that it will.
The link I have for the brace is:
http://www.tanabe-usa.com/underbrace/
I will be installing this brace and giving my feedback this weekend. From what I gather since I do not have an after market sway bar, rear sway bar, or rear tie bar that it will make the car understear a bit. We'll see. I'm anticipating this install to take an hour tops.
The instructions are, unfortunately for me, in Japanese. The picture that shows the bolt-on points is very easy to follow, however. I haven't decided yet, but I may be doing write-up for installation after I am finished.