And When it comes to installing them, if you go nothing but king springs you will need spring compressors and you need to know a little bit about struts, how they work and different types e.g. Leaf springs and Mcpherson struts. Coilovers are (usually) a straight strut swap, out with the old in with the new. i suggest putting new shock absorbers in while you are there if you haven't done so since you have owned the car. generally speaking if the strut/spring is made for your type of car then it will fit with no other modifications. If you go very low keep in mind the legal side of things for your ride height, if this doesn't worry you, you may need to roll the guards so your tires don't rub on the guards when driving or going over a bump. cheers :)