I know that experienced members will likely tell me to just connect a pressure gauge and find out for myself but, I would like to get some input on a concern that I have. I just recently rebuilt my 700R4 and installed a new 10 vane pump with the high rev slide spring. I also added the Sonnax line boost kit with heavier TV valve spring, .500boost valve and larger low/reverse boost valve. My concern comes from something I read about the pump pressure relief valve. With all of the line boost and other pressure rise mods installed, can I still expect pressure to be set by the pressure relief spring? One article stated that the stock spring is set for 165psi. That would be low for my application. I am hoping for more like 300psi at full TV. Any thoughts. I do plan on purchasing a 400PSI gauge to check this out for myself but I wanted to get the question out there and see what experience others may have had with this.