By Crewdy
Okay, here they are.
1. Honda Civic Coupe Si
Unlocked at beginning
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2. Acura RSX Type S
Unlocked at stage 3
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3. Audi A3
Unlocked at stage 3
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4. Cadillac Escalade
Unlocked at stage 2
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5. Ford Focus ZX3
Unlocked at beginning
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6. Ford Mustang GT
Unlocked at stage 4
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7. Audi TT Quattro
Unlocked at stage 3
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8. Hummer H2
Unlocked at stage 2
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9. Mitsubishi 3000GT
Unlocked at stage 4
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10. Hyundai Tiburon GT
Unlocked at stage 2
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So there you have it 10 mystery cars that are unlocked in the game.
I hope this walkthrough help you and try to find my other walkthrough about hidden shops.