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For spacers: 20mm(F) and 25mm(R). I had 20mm all around but you can take the rear out a little more. I can't remember if you would have to roll the rear fenders with a 25mm spacer.
When I had the S-techs, my rear shocks started to give out after about 8-10 months. Expect to pick up a set of shocks if you do a lot of spirited driving. And possibly camber kits.