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I recently had something very similar....only when turning and under power....no noise coasting or at idle while turning....spent all day at the dealership...even tried rear diff fluid change per TSB...no luck. Went to my speed shop/tuner (RPM) 7seconds in the car and he knew what it was.....the HF cats! Couldn't take the heat! I had seen pieces blowing out of the exhaust a couple of times....anyway, had them gutted....grinding noise gone.
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