Need a custom fuel map
Hey, there. It's your motorcycle so you can do what you want, but any time you make a change like this, you have to adjust the fueling to your motorcycle. In this case, you removed the cat -- which is great -- but by uncorking this and flowing more air through the system, you are going to have to add more fuel or you are going to create not only a lean fueling condition -- but one that can potentially severely damage the engine. The right way to do this would have been to have done a baseline dyno run just to see where you are/were. Then if you made a mod, you have to adjust the fueling. Popular ways to do this are by adding something like a Power Commander which augments the base fuel map that is loaded to the ECU and adds/removes fuel as needed. It takes a dyno to do this the right way, but the end result is a nice custom-tune to help your motorcycle achieve its full potential. In the case of the Termi full system, it comes with a usb key and a fuel map that has already been created to work with a your motorcycle and exhaust setup. That key contains a fuel map that will overwrite the one that comes from the factory. On a DVT-engine Multistrada the result is absolutely profound!
So...bottom line...I wouldn't ride your bike in its current state until you get the fueling sorted out.