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I have narrowed it down to start at about 60 miles an hour in 5th gear, with low load, below 3.5k-3k rpm, cruising. It's hard to hear it with the drone of my exhaust and with the catless DPs it's even louder but you can sure feel the "brr-brr-brr-brr-brr-brr", consistent and even but gets faster as I accelerate.
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