First let me state I'am no mechanic!!! I had Bilstein HD's put on my 993 about a month ago. Now when I back out of my driveway...turning to a sharp left...a fairly loud clanking of metal sounds for a split second. Took it into the mechanic that installed the Bilstein's aned he put it up on the rack....checked for rub marks etc....nothing....and of course when we backed up no noise....but since then it has been making the noise on a hard left while backing.....Any idea other then return to mechanic again.....Thanks Roger

 

which sway bars are you using and which droplinks? might be the rear sway bar hitting the arms.