Hi just recently got a s3 with a bam engine and noticed that its sounds like there is a loose bolt or some thing rattling around in the engine between 4 and 5 thousand rpm basically sound like a diesel lol but when not driven hard there is no sound the noise also comes back at about 6 and a half thousand revs could it be the bottom end or if that was the problem wouldn't it be marketing the noise all the time thanks
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