Okay, here's the deal. For some reason, the bolts holding the two brackets for the RSB were not tight enough. I don't know if they worked themselves loose or they weren't tight enough in the first place because I put the RSB on when the car was off the ground. Anyway, as the car entered a turn, the torque on the RSB applies up/down force onto those brackets and they have been slipping up and down. The brackets have slots for the bolts rather than circular holes, so they can move up and down if the bolts aren't tight enough. I can see on the brackets where the metal slid on the bolts. Maybe I'll get a picture.
I tightened these down and spun around the block. No Popping! Maybe I need locktite on these bolts?
2012 Ford Focus
Sonic Blue SE 5Dr
203A Package, 6 Speed Auto
Mods: Debadged, 30% LLumar CTX Tint, MS3 RMM, Steeda RSB