Hard to tell anything from the video. There is no longer an HKS USA (they closed last summer), so you can't do anything there. The new imports for HKS might have some recourse though, but you'd have to talk to the people you bought it from and have them take care of it with whoever they got it from.
Check several things:
1. heat shield for carbon canister as mentioned
2. check to see whether the tips aren't loose for any reason
3. check to see that the exhaust isn't making contact with any other parts under the car
4. I've see quite a few people mistake VQ rasp for light rattling, so that might be the issue.
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