Little Rattling clanky noise when driving in low rpm

[Shue Her]

Hey guy, My P5 is making a little rattling clanky noise when i gas the car to go forward after i shift gears. After it passes 2000 rpm the clanky noise stops But this only happens when the engine gets hot and warmed up. When the engine is cool, the noise is gone. What can it be? There is no hard rattling or vibrating, but only that little clanky noise. (uhm)