Standard rates i've been told are 275/350 for the pro street, i think the r1 and r2 may end up a little stiffer but haven't seen the final specs. It's eibach you can be sure there will be a big press release when they are ready. I would venture to say they are possibly the biggest name in aftermarket suspension, they are putting a lot of development in these to make sure they don't disappoint.
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