sup, i will answer your questions. an air cylinder replaces your springs and shocks, most are bolt on kits which bolt stright up to your struts. runnin cylinders your need a air tank, compressor and if you want your car to go FBSS(front back side side) your need valves. also gauges and switch box.

i have a full air cylinder kit in my 92 civic, im runnin the cylinders of two 3gallon tanks, a 380c compressor and 8 1/2 valves and 1/2 lines. it is very fast and cost me $3,000 but i live in New Zealand so would be alot cheaper for you.