So I know I’ll catch a lot of Shit for it just like everything else I do to my car.... but I wanna add an electric exhaust cutout to the rear just for the joke of it right before the muffler and after the axle back so I need the inner and outer diameter of the pipe leading into the muffler thanks in advance!

 

This is new territory to me, friend. Sorry I can't seem to find info on said diameter. I do appreciate the concept here if the idea is to have the exhaust open when at higher RPMS, at your choosing. Honestly I find this more appealing than simply making a more free-flowing exhaust, since flow of exhaust seems to be such a trade-off. The only bummer to me would be noise.
I'd recommend procuring a gasket for the area, disassembling and measuring, perhaps with a little digital caliper if you wanna be fancy/super accurate

 

In for updates..