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Johnny -
Although my Milltek has been on for longer than yours I've also started hearing a loud "vibration" noise coming from the rear of the car. Mine only happens during WOT and at a higher RPM (around 3800 ~4000).
I was going to crawl under the car this weekend and see if I can figure it out. I also think the sound is coming from the rear panel vibrating against the exhaust.
Let me know what you find out.

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