REWARDS - $5,000, Respect
Get a car, making sure Cesar gets in, and head to the showroom (yellow blip) on your radar. When you pull into the marker, Cesar mentions the cars are on the second floor. After the cutscene, drive your car out the window and begin to follow Cesar, marked by the blue blip on your radar. He's one crazy driver, so expect some crazy stuff as you're following him. Eventually, he pulls a stunt that attracts the cops and you'll get two stars. Don't pay too much attention to the cops and continue following Cesar.
After a short time, Cesar will trigger a Nitro boost and you should follow suit by pressing Circle or L1. Soon after, the two stars go away. When Cesar turns into an alleyway and you follow, the cops are once again on your tail. Back out of the alley and continue following Cesar as he goes around a construction site and eventually loses the cops again. After that, you'll need to head back to your garage and park in the red marker to finish the mission. $5000 and respect earned.