Typically with the 300 Series GR Sport models because of the E-KDSS you can't change the shocks unless you swap in electronic shocks that communicate with the Toyota ECU. You can change the springs out for raised springs and use the OEM shocks however what happens is the vehicle gets a lean to one side. This is due to that E-KDSS system. Formula 4x4's Engineers have worked out a solution and Fulcrum Suspension will be releasing a Lift Kit in the near future for these models so keep an eye out!