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I'll bet you that the Berk pipe has a crack in it. A hairline crack can be a bitch to find and will make a rattle that will change with the temp of the pipe. Check around the flanges and all the welds. Bend and flex them. It could also be in the hanger area.
I had a catback exhaust with hairline cracks at some brackets in the axleback section and once the cracks were welded the rattle went away.
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