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Vibration when rev/accel help needed

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Hi to all, I have 2002 735i, 77000 miles. It's just started to vibrate rumble knocking type noise when you accelarate. It also does it in park when you rev the engine. No smoke from exhaust. No loss of power gear change all ok. Engine quiet in idle. Noise seems to come from the front and you feel it coming through the pedals and seat. was maye thinking exhaust blow but sounds quiet. The noise goes up with the revs like something catching blowing. Any advice suggestions very welcome.
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