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Yeah, it was a cold start, that's why you hear the noise go away when the idle dips. Was trying to smell for the exhaust but didn't smell it as too obvious, possible it was there though. When I first installed my Borla, I had a nasty rattle/resonance from the flexible couplings. I covered them up with exhaust wrap which helped a lot with the rattle. It could be that they finally cracked.
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