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You won't need it. If you want it you will be better off with aftermarket setup for even more aggressive handling. Why wasn't it available? When did you order it? Do you mean hypersport option which became available in April?
The JCW suspension kit will be available soon. Check out motoringfile.com for further details. I was considering the addition of the ss for my mcs order, If I feel I need it, I will just get the JCW kit later on. This is What Gabe is doing with his MCS and seems like a good idea to me.