999
999 puts a patient in the back and traffic in the way: drive the ambulance to hospital through obstacle-strewn roads, catch the boost items mid-route, and arrive with the vehicle recognisably ambulance-shaped.
Damage persists across the run, so every clipped bumper is borrowed from your finale.
Tip: boosts are for straights, never corners — the speed you gain entering a bend is exactly the control you lose leaving it. The supercars tag races on.