i don't know stock sizes or max sizes, but I have eibach sways and I like them.
The E30 is what all actual driving enthusiasts are after. It's an unpretentious machine, quietly capable of spectacular feats of handling. It's light, simple design is rugged enough to run against $400k rally cars, but on the street it' communicative chassis delights even the most disinterested driver. It really is one of the world's ultimate driving machines