I got the same exact situation going on with my berk cbe setup. Around 4K rpm's i get a rattle from the rear, passenger side. Sounds like it's internal, but not a 100% sure about that. I did check the heat shield and it's not the issue. Nothing seems to be even close to rubbing/touching in the under carriage. This noise is an f'n irritant and it's starting to drive me nuts.
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