The SAS has no compressor to mount, no hoses to run, no fittings to fail. Absolutely the easiest install. Raise and lower your rear end at the touch of a button. Add air pressure to improve ride quality during changing road conditions or while hauling added weight. The SAS has an inline pneumatic filter, all the air the SAS breathes comes through it. All the install consist of is mounting the SAS and wiring in a switch (momentary toggle included). Every SAS is supplied w/ a plugged gauge port outlet. Fits soft tail H/D’s, & Customs. The SAS comes with all the needed mounting hardware except the shoulder bolts.