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Like Remonster said its open for about 30 seconds on a cold start then shuts. I took the clip out and fixed mine in the open position this weekend. It didn't make a big difference, but you can tell it's open at lower rpms now. Its now a little louder than it was, but still super quiet IMO. I would say 3000rpm is a good guess as to when it opens, as it used to be silent below that, and I can now hear the car a little bit.
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