For anyone that's interested, I put a Sprint tune (inc ZF) on a mates FG MK2 F6 over the weekend. Unlike when I did this to my G6ET, we got no ABS errors which tells me that the FG MK2 F6 must have the same (or compatible) ABS calibration as the FGX Sprint. So for FG MK2 XR6 Turbo / G6E Turbo owners, you could follow the instructions in the first post and then use ForScan to change the ABS calibration to the FPV / Brembo one and you should be good to go. Obviously there's no point unless you have the right hardware to go with it such as injectors / 3582 turbo.