[grounded]

Is most of the stability only because of the 4 link? Would bags also perform as well if not better?

Coilovers are designed with performance in mind(hence thier use on a lot of race cars). Air bags can be set up to perform well, with a good shock and the right PSI in the baggs. I'm a believer in coilovers for an allout performance vehicle. Now if you have the funds a set of front and rear coilovers for the track, and a set of ART Shockwaves for cruiseing and shows would be cool as hell.