i know this is probably played out and ive read some of the other posts about this topic but the answers were much too technical for me......im just wondering what is air suspension? what is the diff of coilovers and springs, and basically what i need to lower my car safely and keep it so it is adjustable. also it would be awesome if someone could tell me how much the different set ups would cost. and how easy is it to adjust the height of the car once it is lowered?