Audi S4 Noises

My 2005 S4 Cab Makes A Heavy Rattling Sound At The Moment Of Start Up. It Lasts Only For A Second Or Two Then Stops. Happens When Engine...

During Ingnition, My Car Makes A Rattle And Shake Sound That Is Coming From The Engine And The Idle Drops To Around 500 Rpms. It Only Occurs...

When Driving On The Highway, I Can Hear A High-pitched Rattle That Almost Sounds Like A Squeaking/squealing Noise. I Am Not Sure Where It...