My 2015 GT has 4k on it and so far my only complaint is nibbling synchros on a cold transmission. After things warm up the shifts are fairly clean so far. I've banged on the drive train fairly hard to redline with zero issues! But mostly I'm taking it easy on the drivetrain, no dropping the clutch! Those P-Zero's are spendy on the GT Performance Pack and have no idea what the track record is for the Torsen Diff. Next spring it will have 5k+ and plan to change diff and trans
fluids. Researching what to use to improve performance and longevity.