They are 16x7 Rota Circuit 8's, 40 offset. H&R Sports with KYB adjustables. After much fiddling around I knocked something loose behind the brake rotor and the sound is gone. Its really cold outside right now, so I'll hope it was just something stuck in there. It was windy/rainy today, so hopefully a small rock or something just got stuck.

I've been learning to heal-toe downshift lately, could it be related? Thanks for the input guys.