A wing would be nice, but you really have to think about drag and the real cost of aero.
You need to eek everything out of a spec (2.5) Boxster to be competitive in TT4 and you won't be. NASA really screwed to pooch on this by kicking everyone out the the higher alphabet classes to TT4.
Are you going to be significantly faster in the corners that the loss of top speed on the straights works for you? The tracks you run and data acquisition should help you decide.
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