You can go for mod B in my post it will be the same mod as what I did to my Forte.So this can be done on the 2019-2021 Forte GT? Or not worth it?
320mm disc, 12" XG2P caliper mod.
GT come with 18" wheel don't they?
So you wont have any fitment issues with the wheel.
I think the GT comes with 300mm or 305mm discs and single piston calipers.
You will increase disc size from 12" to 12.6" and to a 2 piston caliper from 1 piston caliper.
3rd gen BD (2019-2021)
* 320mm disc, XG2P calipers (12"), 17" wheel and above
Kia All New K3 XG2P Brake Tuning (Example 1)
Kia All New K3 XG2P Brake Tuning (Example 2)