Gran Turismo 5 Prologue
S Class events:
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Successfully complete the main A, B, and C Class events with a "Bronze Medal"
or higher rank to unlock the S Class events.
Bonus cars:
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Successfully complete the indicated task to unlock the corresponding car:
BMW Concept 1 Series tii '07: Win all B Class races.
Daihatsu OFC-1: Win all C Class races.
Ferrari F2007: Win all C, B, A, and S Class races.
Nissan GT-R Proto '05: Win all S Class races.
Nissan Skyline Coupe Concept '07: Win all A Class races.