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Hi everyone,noticed my 2003 sti has started a strange metal ratteling sound as the revs drop from around 3000rpm,this isnt affecting the performance whatsoever,or doesnt seem to be,when the bonnets up it sounds like its the turbo?only happens around 3000 revs and as the rev counter is on the decline.could be a heatshield from the exhaust?any help appreciated.thanks.