Your new STS Air Suspension Kits will be hot. An air suspension kit is an incredible upgrade. We have the biggest selection and variety of STS Air Suspension Kits. The custom STS Air Suspension Kits we sell include all the suspension parts you need. Upgrade with STS Air Suspension Kits. With an aftermarket air suspension kit, you will rule the next car show. Your car will be much better with new STS Air Suspension Kits. Ditch your underperforming stock air suspension and replace with an air suspension kit.