Everybody knows that you need to win a race to get the most reward money, but in illegal races, it is all or nothing. You have no choice, but to win the race. Also, you can race against any vehicle/s since there will be no rules here.
Drive your car as fast as you can till you reach the finish line. This is not about racing through time as you need to win against your opponent. You have a booster to be use whenever you want to. Don't regret using it as there are lots of boosters on the road that you can pick up.