H said that there is a tool that will do the HTTP Mangler functionality out of the box.
So here goes. WebScarab-NG is the tool that will do the trick. First we select the feature that will allow us to setup the proxy listener as seen in the image below.
Then we need to configure the proxy listener to the ports etc we need as seen below.
And pretty instantly we have the HTTP Mangler functionality. Apparently this is going to become a feature of SURU as well!