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I'm considering getting konis and a 12 bolt, and will probably go with the 4/4, but if there's some reason why not to, I'd like to know.
3rd gen rears are a monotube design while 4th gens are a twin tube design. Some claim to prefer the handling of the 3rd gen over the 4th gen. I ordered a set of 3rd gens rears to replace Bilstein HD's.