Steel (leafs, helpers, stronger springs) vs. AIR - The difference is adjustability.
Only air springs can bring your vehicle back to the factory ride height. Just add air to level your vehicle or to add suspension muscle for rough, uneven roads. Then, when your trip or work is done, simply deflate the springs a bit to return your suspension to the factory rate either manually, or by using one of the available compressor kit options. Custom tune your suspension for most any road or load conditions -- quickly and easily with air. Steel or hard rubber helper springs are not the best solution. Your vehicle must sag some to engage these helper springs, so once they add tension your vehicle is no longer level. Plus, the ride may be harsh when the vehicle is not loaded because of the added tension. Air springs are the 1st choice of the professional installers. Look at the image below ... the difference is obvious.

Nowhere will you find more complete and detailed information on Air Lift® Air Spring Kits and load control products than right here in the Century Performance Center website. The links on this page will take you to the information on the Air Lift products you are looking for. If you see something you need that we do not have listed, please contact us using our Live Chat feature or e-mail us through the Contact Link above.
Benefits:
One of the most important issues with any suspension modification or upgrade is SAFETY! With an AIR LIFT® system you have more stable control of your vehicle in both handling and braking. By offering added stability when you have additional loads upon your vehicle, the AIR LIFT® system increase road safety for you and your family as well as others on the road with you.
Depending on your vehicle and the available kits, you can add between 1,000 and 5,000 pounds of additional load carrying capacity to your vehicle. (WARNING: Never exceed vehicle manufacturer's recommended gross vehicle weight rating, GVWR).
If you look a the image at right, the benefits to using AIR LIFT® suspension components is obvious. The clear leader in Safety, Load Control, and maintaining Suspension Geometry is AIR LIFT®!
When your vehicle's suspension is abused by added loads or improper ride height, steering, braking and other issues are obvious. But what many people do not realize is that these added loads can also cause early suspension component failure. Steering and suspension components, springs, shocks/struts, bushings, and more are adversely affected by improper ride height.
Quick Links to Air Lift® Information (application guide links are below):