Raced with the GT2 a few nights ago. I drove the Porsche, BMW and Vette. Several other drove the Porsche too. All cars were fine as was the Porsche until I had a lock up and immediately afterwards I started getting repeated small "clicks" in my FFB that got worse and worse the more I locked up. It eventually got to the point it was constant - like several "clicks" a second. FFB otherwise felt fine and car was controllable. It didn't feel like flatspotting should - there was no regular pattern to it like a flatspot would feel and the effect was more like constantly driving over small stones scattered at different intervals. It was however clearly linked to locking up the wheels and got worse the more I locked up. No one else felt the effect and I've only felt it on the GT2 Porsche (on any track in single or MP). I'm using an OSW and I've attached my controler config file but could not see anything in it that explained this.