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I have the exact same engine hammering sound on my 2013 BRZ, but it's so sporadic that I haven't gotten any good video footage. Props to the OP for some hard evidence of this flaw.
Happens during light (30-40%) throttle after a hard pull, like merging into traffic after a freeway onramp. I'll be able to reproduce it with throttle manipulation for maybe 30 seconds, but then it usually quiets down before I can get to a safe place to record.
It's worst around 3000-4000rpm, but I've heard it up into the 5k range too. Does not seem to be associated with any particular gear or MPH.
Might be correlated with ambient temperature? It was happening more frequently during a few hot weeks this past summer, and I've only experienced it when the engine is good and warm.
Problem has persisted through a couple oil changes and a high pressure fuel pump swap last week to get rid of crickets.
The dealers around me won't do much unless they can see the problem in action and it's almost impossible to reproduce on demand. Any hope of getting this fixed?
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