By lowering your Pony, you enjoy better handling, improved aerodynamics and a cleaner look. We offer several 1999-2004 Mustang Air Suspension kits, including some that apply to only the front or rear of the car. An Air Lift performance complete suspension kit impacts all-around performance more, especially with progressive rate sleeve air springs and a digital controller for easy adjustments so you can hit the road or tack whenever necessary. A second compressor integration harness helps with boosting reliability further by ensuring proper air pressure at all times.