You start off with one race unlocked. As you win, the next race gets unlocked. Win them all in the series and the car is yours.
Effect - Code
Aston Martin DB4 GT Zagato - Beat the Aston Martin series
Cars
Gain the following amount of points to unlock the following vehicles.
Car
How to unlock
AC 427
Gain 250,000 Master Points.
Shelby GT500
Gain 100,000 Master Points.
Chrysler ME Four Twelve
Beat all Supercar Series.
Easy travel
When you start the game, rent the cheapest car, then buy your own car. Go to the Saturn car dealership, and buy a Saturn Sky Roadster. It is cheap and will leave you with some money left over. Then, buy the $100,000 house. As soon as you get to go on your own, select the map. Target one of the shops on the border. Go around the entire border and visit every shop, car-dealer, lobby, and club. When you are done with the border, do the same thing with the middle. Once you do this, it will be very easy to get to places because you can teleport anywhere you have been. Also, when you are doing many races and get money, you can just teleport to the car dealer, club, part shop, or retailer.
Own all the houses
Win all the Viaggio Grande races.
Recieve Free Cars
Become president in these car clubs to have the corresponding cars get sent to your garage. Make sure you have enough garage space, or you won't recieve it.
Effect - Code
Chevrolet Corvette Stingray 69 - President of Classic Car Club
Ford Shelby Cobra Concept - President of Club Stripe
Caterham CSR 260 - President of Clubman Car Club
Jaguar Type E coupe - President of Club d'Elegance
Koenigsegg CC8S - Beat the Master Challange Series
Lamboghini Countach 25th Anniversary - Earn 1,000,000 points
Lotus Esprit V8 - Beat the Laenani Collection races
Mercedes-Benz CLK DTM AMG - President of German Car Club
Spyker C8 Spyder T - President of Accolade Ala Moana Club
Teleport to any road in Oahu
Finish all the King of the Hill races on the island
Effect - Code
Teleportation Finish 1st in all races