I also have Airlift bags in both springs, and Bilstein shocks.
I just want to point something out here concerning airLift bags, or any other method which would be used specifically to pre-load the coil springs in a drag race car, ( I know that Steve was not implying that he uses the AirLift bags for drag racing, so the following comments are not aimed at him).....
Some guys have used such methods to pre-load the coil springs on the drag strip to control or prevent roll rotation during the starting line launch, or in attempt to straighten out the launch of a car that is pulling to one side during the launch, but for drag cars capable of wheel stands, there is an inherit danger in doing that: when you pre-load one side of the springs, (ONE SIDE meaning compressing or extending either the drivers side spring or the passenger side spring) what that can often do is cause the car to pull to one side during gear shifts.
So why is there a danger in the car pulling to one side during a gear shift? Because for cars capable of getting into the low 10 second and 9 second ET neighborhood, which are therefore also capable of getting the front tires off of the ground during the starting line launch, if the front tires are still off the pavement during the 1-2 gear shift, and the car then pulls to one side before the front tires come back down to earth, this can and often has put such cars on their door, or even worse put the car into a barrel roll and on the roof if the wheel stand was high enough.
Keep in mind that many experienced drag racers know that during a high wheel stand, the best thing to do is to keep your foot on the go pedal, and grab 2nd gear in order to end the wheel stand in a controlled manner, instead of backing off the gas, and having the front end come crashing back down real hard, which usually damages header tubes, oil pans, and transmission pans. Just a heads up for guys running cars which get into the 10's and the 9's at the drag strip. For those cars, controlling the launch with varying the drivers side and passenger side settings on DOUBLE adjustable shocks, is a much better way to control how straight the car launches, instead of using any method to pre-load the coil springs to accomplish that, since using double adjustable shock setting will NOT cause the car to pull to one side or the other during gear shifts like pre-loading one of the coil springs can.
BTW, what I explained above does NOT apply to the use of a rear anti-roll bar, UNLESS perhaps you're using the bar to adjust one side tighter than the other, rather than having it adjusted in a neutral static position. Sorry to get a little off-topic, but I think this is a safety issue for some of the quicker drag cars and street/strip cars. Ofcourse it doesn't really apply to 11,12, and 13 second cars since they won't be doing wheel stands off the starting line any way.