Theoretically, perhaps, but in practice I think you'd have a hard time sourcing and or modifying an off-the-shelf set of conventional coil springs for fit and load to achieve an optimal ride-height for all around use not to mention abnormal tire wear, poor handling and OBC warnings out the proverbial wazoo as the switch control system would enter failure mode. Keeping in mind that the SL weighs as much as a Jeep Grand Cherokee, your car would probably sit very low and you might even bottom out at speed.
In addition, most OEM air suspensions work in conjunction with adjustable dampers (shock absorbers), so you'd also probably want to replace those with conventional ones.
Last edited by SDSL; May 27, 2008 at 04:32 PM.