....... wtf.... guys... if you go to a bigger rim, u just decrease the sidewall so the outer dimensions of the tire stay the same as if you had a 14 inch rim on there... good buddy of mine has an early e30 on 17's and is SLAMMED on a ground control coilover setup with NO rubbing. Here's a little pic (and he's had it lower than that) -
and since mark has an '86 with the larger rear fender wells, he'll be fine.
mark, all u have to worry about is correct offset of the rim & increased tire wear, which WILL happen due to the increased negative camber caused by the lowering