I think my rear bar is by ISC Racing (no longer available), but looks identical to the ST model, with three choices for end link mounting.
Works great with a good front bar, but don't upgrade the rear bar unless you already have the front covered. Otherwise, you'll be tail happy enough to kill yourself accidentally. Seriously.
I don't spend much time changing anything for an event (this is also my DD). Throw on race rubber, kick in the camber, maybe tweak the front Illuminas a bit.
Other than the tires, I
really do drive my race car to work everday. Wouldn't have it any other way.