Knocking noise coming from engine. First noticed an issue after road trip from Oregon to Vegas. Upon return home, the car called stalled at a red light. Car restarted and ran but now has a soft audible knock. Car just reached 101k. Change oil and filter every 3000k or 3 months with synthetic. Had external pulleys and tension belt replaced within the last 20k. New oil, checked it for metal shards. None were found using a magnet. Replaced fuel filter and spark plugs hoping it was just from crappy California gas. No change. Research suggests a timing belt assembly issue. Looking for others thoughts before I take it into for a diagnosis.
See video below:
YouTube - 2002 Subaru WRX Engine Noise