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Not a lot of experience with GM LS engines specifically, but sounds like spun rod bearing to me. This is probably the 2nd most common engine issue on the STi and I thought it happened to my car at one point but turned out to be an improperly torqued clutch install (thankfully). The sound is almost identical to the one in the video you linked.
When is the last time you checked your oil level (note to self to check mine, currently at 800 miles)?
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