I'm not very familiar with the dominator but I would say yes. Do a search, this topic has been covered about a 100 times. There are many ways to do it, from regulator to bypass, store bought, pieced together etc. I think around 15-20PSI is what usually works. It just saves a lot of headaches down the road. No water in the oil, no gasket issues, better cooling, better chance of getting a good consistent operating temp out of your set up, etc. I may be way off base and the dominator only produces low pressures, any smart dominator guys out there? Remember these are car motors, cars have radiators, and most radiator caps are designed to release around 7-15 PSI depending on what type of cap. That should be your guiding priciple. There are plenty of motors with good gaskets running at 35 PSI, but my question is why should you have to worry about it, fix it once the right way-Aluminum Squirt