I finished it yesterday. Took me less than a week in normal mode.
You have to go to the Car Shop (should be a light blue or dark purple circle) if I remember right, after you pick up her car.
My garage I had:
Toyota Celica (NA)
240SX (NA)
Honda Civic Si (NA)
Mitsu Evo8 with carbon fiber body kit. Pumping out 450hp
Nissan Skyline all decked out to 10 stars (no spinners though) with 500+hp
I couldn't figure out how to unlock the widebody kits though
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