So got my RV-6 dp installed yesterday. First, disconnect the second cat from the factory catback and remove it. It really looks like the way to go after there is to take off the wheel and brake and axle, and go in through the wheel well. There you can cut the edge of the pipe coming off the exhaust. Then unbolt the flange. The cat comes out and the replacement can go in. I made sure I'm catted between the dp and the exhaust.
This piece really is fantastic.
This piece really is fantastic.