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With stock power, I do not believe larger tires provide any actual grip in cornering or handling and in my view technically decreases things unless you have a power bump where traction is limited by the torque of the wheel rather than the slip angle which with stock tires and wheels, once moving you never are limited by wheelspin traction which tells you the tires are plenty wide.
Fatter tires do not offer better road hugging cornering ability. They provide a tire to not start spinning and smoking under cornering as would happen with a high horsepower car where fat tires helps keep traction in general which means better traction around corners because as we know, spinning tires around turns swings the back out and decreases traction in the spinning tires.
You add extra rotational and unsprung weight by adding bigger tires. 285s add 3 pounds to the tire atleast at the outermost part of the tire which means the most significant effect on rotational accereration.
At the end for stock power or even a bit beyond, the stock tires provide the lowest weight tire with the proper amount of sufficient grip to keep the tires planted.
You only knock performance if you increase. The GTS has more torque and almost 50 more HP which makes sense why it uses a bigger or wider setup
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