Before you get to challenge Darius, you must race Wolf, Kenji, and Angie in their new rides: Wolf: Lamborghini Gallardo; Kenji: Mitsubishi Evolution; and Angie: Plymouth Hemi Cuda. You will have to defeat them in the canyon, then the city. Both races are sprints. After you defeat them, you will be able to challenge Darius in his Audi Le Mons Quattro. You will not be able to switch cars before each race. Start with the car that you want to use for all four races. The car needed to beat Darius is a Tier 2 Tuner, because they are the best at turns (Canyon Duel). Kenji's Mazda RX-7 is the best car if it is tuned out to the maximum. However, if you did not obtain the pink slip from Kenji, then your best Tier 2 Tuner should be fine, as long as its tuned fully. Defeating Darius will take many attempts, but eventually you will get used to the roads and will be one step ahead of him, making your chances of winning larger every time you race him. Also, if you cannot make it past the first, second, or third race, try enabling the "Unlimited nitrous" code then hold down the nitrous for the entire race, except for sharp turns. You should have a fairly easy win as long as you take all of the shortcuts. If you miss one shortcut, Darius will take it and you will be in last place.