Hi everybody!!
Well, i´m going to tell you about my car in the last weeks:
Still have the issue.

At the importer service garage, they have been searching the cause for 3 weeks, but nothing happened. All the parameters are OK in the computer, no CEL o registers.... every sensors or actuators are doing right. Last friday they reflashed my BRZ with a new software (send from japan), bay the Knocking sound is still there in the same conditions (testing) that i described to you in the begining.
Tomorrow they going to try changing the knock sensors, but i´m loosing my hope about solve the problem.
So, what can i do??
I been searching almost all the web seeking for answers, but anybody knows something (or anybody replies my questions, like the owner of the video with the supercharged FT).
I ´m really thinking about trade the BRZ for another car, maybe a WRX (but now Subaru has lost my faith on them), a Renault Megane RS Trophy 265 (yes, is a french car and i dont trust them like a japanese one), a VW Golf GTI MKVII (really good car, well built and great equipment, but not fast enought)........ and if i can save some money, maybe a BMW M135i (amazing, but to expensive).
.......... but any of that options caught my feeling and cars s´passion like the BRZ, that why i´m so mad and sad.
If anyone suspect anything about this issue, please help me.
SALUDOS!!