Sounds like it being the idler if you can specifically hear it coming from the pulley, and not just the general vicinity. Pulleys have bearings though which will always fail eventually...nothing to worry about. But it could also be a bad belt, alternator, or steering pump as well. But if you hear it at the pulley def start there a it's the cheapest fix. Either a belt or pulley is WAY more likely your problem though. Idlers are cheap though and pretty easy to replace. I'd def recommend changing the belts along with the bad/other idler pulleys. I always do them all at once. It'll save brain damage later lol...
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Brandon - 13' SWP WRX Sedan