I'm running the 115 at the moment with the mechanical pump but soon I'm going to be deleting the mechanical pump, if you do delete the mechanical and for the flow to simulate the stock water flow you need to block the bypass, use a remote thermostat with bypass and reroute the bypass to after the rad but before the electric pump. The way the pump runs after shutoff is great plus the pumps pulse during normal use and only run permanent when required. It means you get cooling when you need it as opposed to the mechanical fan which is control by rpms which is useless in traffic.