First the only Carrera that can fit a 9 in the front is a widybody. So that lets out most of them
Second, if you want to A/X and desire a lot of oversteer it might be a good idea
Third, for street, looks are big, 9s would look odd w/o the big spacers the factory uses. They wil look odd anyway w/ the same sizex f/r
fourth, for track use a 911 has oversteer at speed, this needs to be tamed, a bigger rear is a very good way to do that.
all street 911s untill the '73 RS used the same size all around, as they became more powerfull the oversteer at speed became more of a problem, so all the higher power cars since '73 have used bigger wheels and tires in the back.
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