Dave : Once again Rob here.....The proper way to check springs for wear is to measure height of the car to the ground....sagging springs usually are tired springs.....stiffer shocks wont affect the body height...I don't have a Bentley or Haynes for the 4K but I am sure you can find the proper body height number somewhere.... Talk to you later, RC 90 90 88 5KCSTQ Rob Carselle - columbus, oh