[edirtaynine]

technically they're all "coilovers"... but anyway, the coilover setups you see basically offer adjustability for height and in most cases damper/rebound too. Also, the legit coilovers have springs that were specifically designed to be paired with the shock bodies that they're attached to. For the majority of people, separate spring/shock combos are perfectly fine and sufficient for street use. "tuned" for street is just dumb talk by people who think they race but all they do is drive like idiots on the streets.