I have a '12 GT with the 6-speed, but I don't know what the trans
FWIW initially every time I jumped on it, the damn thing wouldn't let me change gears quickly. After reading on here that the Barton shift bracket would solve that problem, I got one.
And it did. I felt like it maybe took 75 miles or so to 'break in', but from then on I could rip through the gears at WFO no problem.
HOWEVER....! I just installed a Boss intake and new tuning, and when using the 'Race' or 'Performance' tune(s), the thing apparently now has enough power to overpower the Barton bracket as well. When ripping on it, I gotta let the thing calm down a tad before I shift.
I'm using the stock linkage, and I would imagine a beefier shorter-throw linkage will probably help,if not solve it entirely, so I'm gonna pick one up when I get around to it.
The bracket is cheap and easy enough to install that it's definitely worth it to put one on, IMO