2015 WRX Mufflers on 2012 Forester? Completely Changing My Exhaust Setup

I know this is a bit of a long one but there's a lot going on in this one. Be sure to check out the chapters to skip around if you want.
Several things needed to be changed with my forester's exhaust: The Nameless Performance mufflers were waaay too loud, so I try out a set of 2015 WRX Mufflers I picked up for free.
My Magnaflow secondary exhaust pipe had the catalyst fail and I wanted to change it out, so I went with the Inferno Fabrications catless secondary pipe.
And after the second failure of the Magnaflow converter used in the Inferno Fabrications UEL exhaust manifold, I decided to just switch back to stock.
Not everything went according to plan, but I got the job done and couldn't be happier with the results!
00:00 - Intro
00:46 - Walkthrough of The Current Setup and Issues
13:18 - The WRX Mufflers
15:19 - Accessing and Loosening The O2 Sensors
17:33 - Removing The Secondary Pipe
19:23 - Removing The Exhaust Manifold
21:42 - Swapping O2 Sensors
24:49 - Reinstalling OEM Exhaust Manifold
26:40 - Installing The Inferno Fabrications Catless Secondary Pipe
33:45 - Removing The Mufflers
34:44 - Test Fitting The WRX Mufflers
36:14 - Trimming The Bumper
38:08 - Where Things Went South
42:24 - Update & Thoughts After 1 Month
52:52 - Hows It Sound?
54:07 - A Final Note & Outro

[@jellipig]

Thanks!

[@TwoFourSevenDIY]

No problem! Thank you very much!