Actually, the cats are in the standard mufflers. Installing TORs mufflers, you can keep the cats on file in your garage without using them.
But there's one more thing: coming from a bike like the FJR, you will probably underestimate whats happening while you pull the throttle on the Rocket. It's like "hey, I am going full power but the engine doesn't rev higher quickly!"
Only if you have another bike dragracing you, it will be obvious that for some strange reason, the other guys can never keep up. Because yes, the engine speed is not changing a lot. BUT look at the speedo!