I've got s13 coilovers all round on my car. Its easy on the front, its the same almost as an S12. You'll need s13 hubs and track rods and ends.
On the rear its hard, it will require some fabrication to get the tops to bolt in place. Although I think its possible to do away with the spring on the rear coilovers and use them just as a shock absorber and stick to lowering springs. This would be easier but not as effective as doing the job properly and having adjustable height and preload
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