I have a 2005 gt with 25k miles with the same issues.
Drives like a dream! but sounds like a POS in bumpy parking lots. Lots of clunking and noises!
So Far I have Steeda heavy duty adjustable upper strut mounts, didnt fix the problem, BMR front sway and links, didnt fix the problem, gt500 front lower control arms, nope..... and koni orange shocks/ bmr springs....didnt help either....
im pretty sure i replaced everything you can! I also just got an alignment and had them check the tie rods and everything else for play, and they found no issues.