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I recently solved a similar rattling. Only appeared uphill at low revs. i took the heatshield off the front box and a large stone fell out! it must have got in through the slats that allow hot air to escape.

I also noticed that the O2 sensor wire that is clipped to the side of the shield also vibrates a little as it’s quite loose inside oversized clips. I’ve bulked the sensor wire out with heat shrink- nice and quiet now!
 
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