E30bulldog:Are coilovers legal in STS. The rules state that the spring must be the same style as the original on your car(coil,leaf,torsion bar, etc.).
Well if your car originally came with coilovers (i.e. struts), then absolutely. Section 14.8A, where the rule you quoted is, later says "Coil spring perches originally attached to struts or shock absorber bodies may be changed or altered, and their position may be adjustable. Spacers are allowed above or below the spring." That would take care of adjustable coilovers. And then Section 14.5A says any shock absorbers are allowed, with a few restrictions. So, yes.
But of course being in STS in the MS region puts you in the open tire class, so you might want to consider that before you make a change.