it can vary depending on system/setup. I bought the front and rear suspension and air management while it was on sale.Usually fronts run 975, rears 900, 3P/H management with standard tank and one compressor runs around 2k. I went with accuair endo CT setup which was an extra 1k. 4 bulkhead fittings @ like 10$ each with rubber boots for exterior side. No hard lines in the trunk just yet since I still need to figure out where all the audio equipment will be buried. pretty easy install if you are comfortable doing coilovers and amp installs it’s basically just that. Only other thing would be running the lines. I bought a bunch of buckle straps with rubber inserts and anchored the air lines. If you need help getting started feel free to hit me up!How much does something like this cost btw, I have always been interested in this.