Vicki Butler-Henderson takes two, virtually identical, Audi TTs to the track for a shoot-out. The only difference between them is that one has a manual gearbox, the other a semi-automatic.
Traditionally, auto gearboxes are slow and ponderous, blunting outright performance, but Audi would have us believe that their double-clutch S-Tronic system is much slicker. We find out once and for all which is fastest.
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