"Performance" sounds like it could fit under Technical or Drag Racing to me. If someone posted circle track results on the Drag Racing forum, I wouldn't freak out. Maybe just change "Drag Racing" to "Racing" or "Performance"?
Let's create a Forum to discuss which Forums we might want to add. (I have no opinioin on the subject - just couldn't resist)
There aren't enough performance related questions. Most of the questions in tech are about the car not starting or sputtering or how to wire this or that. Every once in a while someone will ask about forced induction or N2O, but it's fairly rare. I've only seen a couple of posts about cornering. Even then it mostly boils down to them just wanting to know what shocks and springs to pull off a shelf. They really aren't interested in suspension geometry design and modification. The real suspension questions are in the drag forum about how to set up a 4 link or slapper bars or ladder bars, etc... I don't think there's enough content to make it worth while.