Carl, Your gas edelbrocks are nitrogen filled to help keep the bubbles in the oil down. Air shocks are a name for air adjustable shocks. There is a common air line between the 2 sides that you fill up with an air compressor to adjust your ride height. That way, if your "big" friend comes along, you stop at the petrol station to jack up your car so that the driveshaft does hit the tunnel. After you drop him off, you let a little air out to drop the car back down.