Got a new oxygen sensor installed, tuned it a bit, and went to an autocross in my 280Z a couple weeks ago. I was third in my class! Out of three, though. So last. Still, the real victory is that my car made it there, ran, started and restarted fine, and then made it back home.
I also got to try my slicks out for the first time, and man, they make the car much more predictable. Lift-off oversteer is still there but manageable and much more forgiving (which probably doesn't help that I have a bad habit of inducing it). Traction is not as greatly improved as I thought it would be, but I was just running them on the rear.
Anyway, here are a couple runs. A fun run (no time, just learning the course), and my fastest run.