if it goes to STX my recommendation based on the STU effort is to stay light on the spring rates and ride height lowering, you'll need compliance to make a 245 street tire work, especially at Heartland Park
"Understeer is when you hit the wall with the front of the car and oversteer is when you hit the wall with the rear of the car.
Horsepower is how fast you hit the wall, torque is how far you take the wall with you." --Anonymous