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Hi just wanted to get some peoples opinion on a problem i have with my scooby. Its a 53 plate wrx on 79000 miles. Starts and drives fine but when you rev it to 3500 or above it makes a strange sound. Have checked all water and oil which appears totally fine. Wasn't totally convinced it was bottom end as it doesn't sound as a knock its more of a higher pitch noise rather then a bottom end knock.
Not a lot to go on there, but likely a rattly exhaust heat shield. In particular the noisy one tends to be the up-pipe where the shield rattles because the welds break.