I just put in a set of Big City Monster baffles this morning ( I did get a T-shirt with my order). I had to take off the back bracket to get to the screw that held in the bottom stock baffle in. Old ones came right out (exhaust is only a little over 6 months old). Easy to put the new ones in. Drilled the hole with a 1/4 bit. Put them in about 4" in. Put the bracket back on then the covers. Took about 30 minutes.
It's a little louder than the stock baffles. I think the Big Radius exhaust is loud anyway. It does have a deeper tone to it. Only rode for 10 minutes becasue of the rain. I'm probably going to do the auto tune with the FP3. Going to clean up the bike then go for a ride before Thanksgiving dinner.

 

Do you like them more than the ones you had. Is it much deeper ? I had bought a set for another bike I had, but didn't measure correctly way back then. I never got to hear them.

 

A little bit of a deeper sound. I like them.