That’s way better than under driven. BTW, once you use Evans coolant you won’t go back. It doesn’t require pressure to work. You can pull the radiator cap off on a hot engine and nothing will blow out and scald you. The low pressure thing is a big deal to me. It’s easier on the hoses, core plugs and any sealing area. What’s easier to seal? A system with 16-18 psi on it or virtually no pressure?