Auto Fanatic 30G
Drive every vehicle in the city.

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There's a total of 95 vehicles in L.A Noire:

2-Door: 25 Cars
4-Door: 19 Cars
Sports: 8 Cars
Service: 19 Cars
Police: 9 Cars
Special: 15 Cars

You'll have to search high and low for most of the cars but over 80% of them are on the streets driving about, so you'll most likely pass them on your journey. All you need to do is jump in and let Cole start the engine. Once that's done, a message letting you know it's a new car will pop up on the left side of the screen! If no message pops up, you've already unlocked it.

Out of the 95 cars, 15 of them are special unlocks that become available as you progress through the game and level up. To find these, locate the '?' on your map and drive to it's location. Once there, look for a garage with the 'City of Angels' logo on it and an entrance door. Simply walk in, and the garage will open and the car will be inside.