I also thought of higher springs for increasing road clearance, but I have some doubts. These are; handeling of the car during cornering on sharp turns; and may also affect the ride as it will tend to bounce more on longer springs. If you have CNG then it is OK to have longer spring coils. Additional weight of CNG cylinder will take care of the extra bouancy of longer springs. For my Margalla I used these longer springs with CNG. It worked well. However without CNG I am not sure how they will behave.