Sounds like that are really hard to pinpoint. I replaced strut mounts, struts, springs, ball joints, and bumpsteer (as far as the front suspension goes) with Steeda replacements and didn't hear any sounds for months.
When the cold weather crept in, I started hearing a popping sound up front as soon as I'd turn the wheel after a cold start. The cold weather has come and gone and still comes around sometimes, although the popping sounds I briefly heard haven't returned.
Not to mention I've only got 36K miles on my GT.
2010 GT Premium - Automatic - Torch Red