Thread: What is this sound coming from my M4 at 1800-2000 rpm? And should I be concerned?
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      08-19-2019, 05:02 PM   #11
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Originally Posted by drroc View Post
But I assume the noise is still present, right?
As of right now, I had MP HAS installed, oil flush, rear diff fluid flush. I haven't heard it yet but I'll need a few days of driving to see.
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