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I'm at 15,000 miles too. When I first installed them my response was, "wow, those are stiff." However, over the next few weeks (my car is a daily, 55 miles every day) they will soften up quite a bit. Yes, they are firmer than stock most noticeable when just starting to drive off at very low rpm, low load, with just a bit more vibration.
No need to change idle speed whatsoever. Overall, a very good product and minimal compromise in terms of noise and vibration. Would do it again if given the choice.
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