when mine started to go it only did it on revving around the 3k mark, souded like a tappet sound to begin with but as time goes on it gets louder, Doesnt make the noise when engine is cold as oils thicker but when she gets warm it now sounds like someones throwing a few spanners into a tincan, If its any concellation i'm in the same boat, oh well mines under cover for the winter, saves me polishing the bloody thing i guess :P
If your unsure theres hundreds of videos on you tube of knock noises, just search for impreza knocking .
GL
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