I should imagine 25mm front and rear would make the car tail happy..im no expert, but i would say you would be better off with thicker bar at the front....all depends what your doing with the car and stuff i guess.
I'm running 22mm front and 19mm rear Neuspeed bars. If I was you I'd be tempted to see how 22mm front 22mm rear would go like. should feel quite neutral. I certainly wouldn't go any bigger on the S3 (but thats my opinion)
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