WHEN I START THECAR (COLD)THERE IS A NOISE COMING FROM ENGINE BAY,THAT SOUNDS LIKE AN EXHAUST LEAK( NOT LOUD) AFTER 10 SECONDS, IT GOES AWAY. ANY IDEAS? AIR PUMP?
2000 A6 2.7T

No worrys!! Its perfectly normal. They all do that on cold starts. If im in a rush (and have to warm up) I always wait for at least that noise to go away.
2001 2.7t over here by the way.

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Don't You Just Love The Sound of Turbos In The Morning?