How do I Get the 2008 Audi R8 in Midnight Club Los Angeles?

1. Sign up for a Rockstar Social Club account on the official website. Click 'Sign Up' and submit your personal information to create a free account. You can then begin to complete the following challenges.
2. Get $1,000,000 of cash in-game. This challenge requires the player to win enough street races to accumulate $1,000,000. Playing harder races yields more prize money when winning, and can speed up the process.
3. Drive 5,000 Miles in-game. This challenge simply requires the user to drive their cars in-game for a lengthy amount of time. Some users simply leave their game running while holding on the acceleration button to avoid sitting in front of the TV for excessive time.
4. Get 25 Consecutive Wins. From the title screen menu, select 'Arcade Mode'. The user must win 25 consecutive races in order to achieve this challenge.
5. Drive 10 Miles on Two Wheels. Press and hold on the 'B' button (Circle on PS3) and hold the Right Analog stick to the right or left to drive your car on two wheels. Continue this two-wheel driving for ten consecutive miles to achieve this challenge.
6. Drive a 15 mile wheelie on a motorcycle. Press and hold the 'B' button (Circle on PS3) and press the right analog stick downward to drive your motorcycle in a wheelie. Hold the wheelie for 15 consecutive miles to complete the challenge.
7. Cruise for 25 hours in-game. Simply drive your cars for 25 hours on the streets in-game. Races do not count as driving time for this challenge.
8. Total your car 5,000 times in-game. To complete the challenge, get into 5,000 accidents in-game by crashing at high speeds to wreck your car.
9. Jump 200 meters with your car or motorcycle. To achieve this challenge, drive your car or motorcycle off a large ramp that will give you a large jump distance.
10. Win 350 races in career mode. On the title screen menu, select 'Career' and complete 350 races against other drivers to complete the task.
11. Destroy 250 of your vehicles in-game. This task is very similar to the vehicle total challenge. Simply drive your car or motorcycle into the water or a gas tank to flood or explode your vehicle.
12. Hit 1,000 opponents while driving in-game. This challenge does not limit you to hitting opponents while just cruising on the street; you can also hit them during a race.
13. Hit 10,000 objects in-game. Drive your vehicle around the streets to hit various objects, such as mailboxes, bus stops and garbage cans.