The cost of a hydraulic suspension system can vary widely depending on the vehicle and the specific system. On average:

Luxury or Performance Cars: The system can cost between $2,000 and $10,000 for parts and installation.

High-end or Custom Systems: For advanced, fully adjustable systems, costs can exceed $15,000, especially if tailored to specific needs or brands.

Maintenance and repairs can also add to the overall cost over time.