I am doing a late model GM hydroboost system for my E9 and thought I would throw this out there for anyone that may want this as a kit. The hydroboost would bolt up to the existing extension housing that the vacuum booster is attached to and would use a GM master cylinder as well. Great for race cars, Restomod cars, ect. The kit would be in the 600.00 range including the HB. You would source the MC for your individual needs.