Dec 16 build 171xxx, just picked up my car tonight after "75d Firmware Update to Increase Performance", which is what Tesla Center was calling it. Definitely feels faster, close to the 100d loaner. Didn't have time tonight to do a 0-60 run, but Powertools confirmed my peak power at 329kw, didn't check previously, but uncorked peak is supposed to be about 280kw.