i know its a little late but my kit is easy street/ air lift, they have indeed been modified, the subframe lays out right to the ground,
i personally know of a airbag it kit and they are junk as they use stock length struts, the lowest they go still don't tuck tire at all and struts really won't last at all.
The air lift kit uses koni adjustable struts iirc, that are about 3.5" shorter then stock, i modified mine more so by about 1" on the bottoms where the strut attaches to the knuckle.
I could not drive the car straight at all when i installed the bags, had to do an alignment right away.
I also did a few other things so i could have some nice poke of the tires, i run 285s on the front and 255 rears, i don't know anyone running wider on a street driven car, never mind with bags,
i also have perfect and by that i mean in spec camber at a 3.5" drop (my ride height)
fwiw, i bought a sd front lip and i can't put in on my car as it bottoms out to the pavement with it on. I may put some small spacers in the strut towers as it literally 1/16" touching.