TSP 1-7/8" 304 Stainless Steel Long Tube Headers and Catted Y-Pipe for 2014-2018 Chevy/GMC 5.3L Trucks
www.texas-speed.com
These are what I got, except I found them on marketplace lightly used. Definitely a chore to install. Took me a whole weekend, but it was also was my first time doing headers and I'm a notoriously slow and steady worker. I do have 4wd, and didn't have any clearance issues. I changed my spark plugs at the same time, couple places mentioned that removing them gives more space to slide in and piece of mind that you won't break one. You'll need a variety of shallow and deep sockets, extensions, swivels, wrenches, etc. There are numerous helpful install videos on YouTube, especially for Silverados, but the process is the same. WOT sounds like a flock of bald eagles.