I'll vouch for Dugg's aluminum brace.
If I would have seen this thread last night when I was at home, I would have taken some pics of the brace for you all to see. It is very well done as Dugg has mentioned and it completely saves the front end from 'bad' breaks. Like most people, I had to run my ZX-5 for many race days using the stock plastic brace. Every crash I would just cringe and hope the plastic brace didn't break. Jimmy, you'll notice how the hinge pin brace screws into the bulkhead, right? Well, when the brace breaks, it snaps right in half. As a wheel continues to pull back from clipping a pipe, it would take the front bulkhead with it since it was screwed into it. I actually considered allowing the hinge pin brace to just 'float' there with no screws just to prevent the bulkhead from breaking! Needless to say it didn't work.
Anywho, I've only raced once since replacing the brace with the aluminum one and I'm happy to say I haven't broken yet. I am curious though what will break more often when a break does occur. The brace obviously is fine and I believe the front bulkhead is now protected and will stay secured... but will there be more strain on the hubs, a-arms,.... or chassis? I guess we'll see. I can report though that a cartwheel-type crash was an almost certain hinge pin brace break with the plastic piece. I had a few of those the other day and the car just kept running.