Anyone know what these flow? Looking at the 22'' long dual in/out 3'' muffler for my avalanche 2500. I saw a picture of the dynomax one and it looks like it goes all the way down to a 3'' where it intersects inside. I've read the magnaflows are a much larger x inside. I would hope it flows more that 3'' where they join. I have a lot of motor to push through 3''.

Any insight would be much appreciated.

Thanks