What is the best way to improve the handling of my Nissan GT-R?

I've noticed that my Nissan GT-R tends to understeer at high speeds. What can I do to improve its handling and make it more responsive?

One way to improve the handling of your Nissan GT-R is to upgrade the suspension and install stiffer springs and dampers. This will help reduce body roll and improve cornering performance.

Another solution is to upgrade the tires to high-performance ones that provide better grip and handling. Make sure to also properly maintain the tire pressure for optimal performance.

You may also want to consider installing a sway bar or strut tower brace to increase the rigidity of the chassis and reduce body flex. This can greatly improve the responsiveness of the car's handling.