Dom is the main character in Fast and Furious 4. He ends up in Mexico Stealing from oil trucks. He eventually leaves. Letty tries to find him but he left. Dom finds out Letty dies. (She really didn’t) He goes after the killer. Dom drives his charger throughout the movie. He eventually wrecks it again. Dom kills the guy who hurt Letty with it but ruins his beloved charger!
Letty is not a main character but she is the sole driving purpose of the whole movie! She is Dom’s beloved mate and ends up losing her memories. In the beginning of the movie Letty drive a BMW. She uses it to smuggle drugs across the border undercover but ends up losing her cover. She is later chased by the drug lords and crashes her BMW.