In races where crew members are used, used a scout (Yumi if possible). If you do not win the race, your scout will.

When in Career mode, choose the Exotic class. When you get to the Stacked Deck level, get a Chevrolet Corvette Z06. Once this happens, Neville, Colin, and Nikki will still have exotic cars. Choose one of them and do any race where you can use your wingman. You should have easy win.