There was a faint rattle on start-up and on initial acceleration in any gear when I bought my S3 at 76k. I had it's cam-belt and tensioner replaced immediately. The noise didn't stop. Now at 99k, the noise is quite loud and aggrivating. It echoes through underground carparks, and rattles like a school ruler being twanged off the edge of a desk on start-up for a couple of seconds. Does anyone have any idea what this could possibly be without physically looking into I?? Any help is much appreciated.