One mentioned tweaking the booster. You cannot. You have to go hydroboost. The hydroboost works on the 4.6L 2V and 4V. It also works on the 5.4L 2V. I am not sure about the 5.4L 4V. If a 5.4L 4V is wider than a 4.6L 4V, than I would say one would be pushing it. If it won't fit, you have to use manual brakes.