Go figure - just bought 2005 Mustang and it sounded just fine on the test drive. After I drove away I started hearing a rattle and popping sound from the right front end. After reading old posts here, I see its all to common of a noise

 

It's going to be either the strut mounts or the ball joints on the lower control arm. Upgrade to the GT500 control arms and strut mounts, and it should be all taken care of.

http://www.americanmuscle.com/frpp-g...T&T5_Var3=blue

http://www.americanmuscle.com/ford-f...0&T5_Var3=blue

Or you can choose others. I went with these, no regrets.

 

Thanks for the info - I will certainly try this to eliminate that awful clunk noise