These come with 160mm length or shorter springs with custom rates, but the D1 spec comes with 180mm length 8kg/mm springs in the front and 200mm length 6kg/mm springs with helper springs in the rear. If you want performance, I'd go with the D1 coilovers, but if you just want to be low, go with the regular ones. They're basically the same, the D1 type just has more damper travel for cars that are not totally slammed.
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