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i had a 2000 Z28 which also had upper and lower A arms with coilovers. i put a shock tower brace the month i bought it. i didn't notice a difference. but five years later my car was a lot tighter than other 2000s because of that and subframe connectors i had installed at the same time.
The F-body is unibody w/ subframes, the upper a-arms and the weight of the car is supported by the body. In that case a strut bar could very well help. The kappa is full framed so not only is the advantage of a strut bar somewhat doubtful the use of sub frame connectors is pretty much out of the question. All subframe connectors do is try to emulate the rigidity of a full frame but since the kappa already has a full frame they wouldnt make much sense.