Something tells me that you need to get more fiber if you are having to upgrade to a tornado.
At least it's a brand new one you are installing. I had to help a friend reinstall a VERY used one. He cleaned the living daylights out of it before we installed it, but still. I know what's been in there. There is a reason I'm not a plumber.
The old one was pretty disgusting. Looked kind of like a witches cauldron with an evil concoction bubbling around when flushed. Tornado Flush has GOT to be an upgrade.