I'm convinced that there's someone on the SEB that has a personal issue with the 370z. Looking at the results from nationals I don't know how you can argue that the Z was the dominant car. While the Z took 1st, it was only by ~.3 sec over the two days. The RX-8 and the MX-5 both seemed to do fine against the Z. The ones who suffered were the Toyobaru's. This seems to points out that the twins should be moved to DS, not the 370z to CS.
I guess if enough people buy the same car and all cry loud enough about having the wrong car for the class the SEB will eliminate your competition for you.
They could have at least one-lined the Z in BS instead of moving the Nismo to AS. How could they even think the Nismo could ever compete against older Vipers, 911's, C6 vettes, etc. Someone clearly had their head up their a$$ on this one.