The stock suspension setup is fine for normal daily driving and for those that don't desire better performance and comfort, but if you drive fast the ride gets a little bumpy and becomes unsettling. So HKS has developed the Hipermax IV GT for lower stance style and to support the vehicle's maximum potential. They have adjusted all four corners to have balanced damping force rate, allocated stroke, vehicle height balance, etc. by putting the car through its paces. These tests resulted in a stable and balanced pressure for each wheel. All these settings will provide the driver with the best performance while keeping safety as the priority. Also they have set the damping force and piston speed for the best comfort possible. They recommend the dial-30 for most comfortable ride.