Way to unlock: You need to complete main mission 74 (The Big Score) and select the Subtle variant towards the end of that mission. Wait until you receive an e-mail from Lester, which is going to include the location of the car in the Rockford Hills district.
Playable characters: Michael
Additional information: In total, you need to steal three cars, where all three thefts are similar to each other. After you acquire a car, you first need to take it to the garage for necessary alterations, and only then to the hideout.
Do not worry about the fact that, on the world map, the exact location is not displayed, because you will have no problems finding it anyways. The e-mail from Lester is, of course, a clue and it includes two pictures - one showing the car and the other specifying the area on the map. The car that you are looking for (Bravado Gauntlet) has been parked at the small parking lot in front of the CaCa store located in the Pillbox hill district. The exact location of the car has been presented in the above screenshots.
Get into the car (unobstructed) and drive it to the Los Santos Customs garage, located near the airport, i.e. in the South-Western part of the city. Along your way, try not to bump into anything to prevent further costs. Drive into the garage and start buying the parts. The mandatory alterations (Heist Prep) cost 11 thousand dollars but, if you have more cash on you, you could also buy two additional upgrades, i.e. the Armor for 5 thousand dollars and bulletproof tires for 4 thousand dollars. Drive out of the garage and, carefully, drive the modified car to the hideout. Park the car in the garage and walk outside.
Rewards for the completion of the mission: none
Requirements for the completion of the mission in 100%:
- Mapped - You need to find the car from Lester's e-mail.
- Not a Scratch - You cannot damage the stolen car.
- Pimped Out - You need to spend a total of 17 thousand dollars on the car modifications. Apart from the mandatory ones, it pays off to invest your money into the two optional modifications mentioned in the walkthrough.