Cesar Vialpando"

Kendl talking to Sweet Johnson

C.J. finds Sweet giving their sister Kendl a hard time because she's dating Cesar, whom Sweet refers to as a "cholo" (an Hispanic gangster, here meant in the derogatory sense of U.S./Mexican half-breed). After she leaves, he tells C.J. to go to the lowrider meeting Cesar and Kendl are going to. C.J. meets a mechanic, who tells him Sweet phoned ahead and he owes Sweet big, so he gives C.J. a lowrider. The mechanic says it's the kind used to compete with by "eses" (or "esses"--male gangstas of Hispanic ethnicity). When you drive it into the garage to learn about car modding, you can get it modded if you want to.

You can choose to gamble up to $1,000 at the competition, which is like the dance game for lowriders. A hooker gets into the car. Press NP2 for down, NP8 for up, NP4 for left, NP6 for right, and whichever two of those are the closest for diagonal arrows, in rhythm to the music to make the corresponding directional arrows light up as they pass in front of the circle in the middle of the screen. I had the best luck the last time I tried by lagging behind the rhythm a bit sometimes to press the keys when the arrow was in the middle of the circle.

Cesar's gang is hostile toward C.J. but Cesar has them back off. He especially needs C.J. to know that Kendl is his woman for life, and he and C.J. seem to accept each other. The Transfender garage of Temple, Los Santos, is open for modding cars. It can mod the Buffalo, Bullet, Banshee, Cheetah, Comet, Infernus, Phoenix, Super GT, Turismo, Windsor, ZR-350, Admiral, Alpha, Blista Compact, Bobcat, Bravura, Buccaneer, Cadrona, Cabbie, Clover, Club, Elegant, Emporer, Esperanto, Euros, Feltzer, Fortune, Glendale, Greenwood, Hermes, Huntley, Hustler, Intruder, Landstalker, Majestic, Manana, Merit, Mesa, Nebula, Oceanic, Perennial, Picador, Premier, Previon, Primo, Rancher, Regina, Romero, Sabre, Sentinel, Solair, Stafford, Stallion, Stretch, Sunrise, Tampa, Taxi, Vincent, Virgo, Walton, Washington and Willard.

Loco Low Co, which specializes in customizing the Blade, Broadway, Remington, Savanna, Slamvan, Tahoma, Tornado, and Voodoo, is open for car modding in Willow Field, Los Santos. 

Both places are indicated on the in-game map and radar by a red wrench. 

A good reference guide to which cars can be modded and how at each mod shop is in the BradyGames guide. Even more detail is provided by the "In-Depth Car Modification Guide" by Mastermind73 at the Gamefaqs web site.

http://www.gamefaqs.com/computer/doswin/file/924362/33385

A paint job at a modding shop will take care of any wanted rating. 

The "Lowrider Challenge" mission is available, and Cesar calls to invite C.J. to a race, which opens the Cesar missions (the CV icon).