US cars have whats called a tire speed limiter. What it means is that whatever the factory supplied tires are rated at is the top speed the car is allowed to go with the factory ECM. If the tires rated speed is above the speed the car can obtain then you would never know it was limited. I will check to see what our factory tires are rated at so i know where we are capped at.


Update*****The 20 inch V rated tires i have are capped at 149mph. Does anyone know what the 18inch tires rating is?