This post would be better answered in a race forum. I know autocrossers like the wider wheels in front so the car has a better "bite" at turn in. Larger front wheels also add additional stress to the front suspension members, so I would think they would need to be strenghtend.
Look at Acura's approach to P1 this year in ALMS. They run the same width wheel/tire front and rear...they didn't last very long at Sebring due to hydraulic issues (probably the same with your car).
Probably not the best idea for a street driven car.
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JGM
2002 Boxster S
1973 911 Green FrankenMeanie
PCA DE Instructor circa '95
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