I made the Pin 5 ABS connector modification on my 2011 Mustang GT to permanently disable the traction control when on track. I ran at PBIR last night and can confirm it works. The traction control is fully disabled yet the ABS works fine. The mod involves breaking the CAN bus high signal line to the ABS module preventing the traction control module from instructing the ABS module to activate any of the brakes. I'll post a follow description of what I did to make the mod later.