stage 1: street use
stage 2: street use with racing and burnouts
stage 3: mostly race use, streetability decreases
stage 4: FULL OUT RACE DO NOT USE THIS YOU WILL REGRET IT! THIS IS WHAT F1 CARS AND THE D1 DRIFTERS USE I REPEAT DO NOT USE THIS!

Sometimes tehre's inbetween stages, like stage 1.5, 2.5 etc. so for a car that sees mostly street use I'd say stage 2 suspension, turbo, nitrous, clutch, brake system should be good. It is what I have on my car.