Installation is sort of reverse, but with some tricks.

Pre-tighten muffler clamps onto the AWE exhaust (bolts barely are long enough and clamps need to be "shaped" thru tensioning to fit correctly).

Then remove clamps and engage them on the exhaust brackets without the exhaust.

Install 1 cat (I chose drivers) and then loosely fit the (drivers) muffler to that.

Loosely fit the other cat and muffler into place - since everything is a slip-fit, you have to leave some wiggle room to get the next cat and muffler to engage both the turbo studs and the opposite muffer at the same time.