O.K. time to spend money, what I cannot find on this site is if a roots blower will feel better under partial throttle, bassically I have a daily driver and am tossed between a vortech and a roots, what is the difference between each at part throttle? and at what throttle position/rpm does each type of blower start to show its power gains? this is a make it or break it for my decision since peak H.P. is not a huge concern. also do roots blowers have a pressure release valve like a centrifical? or is it not needed?