Ryan, I have owned the muffler delete with 3.5" single walls, 4" muffled axle back with 3.5" single walls, and 5" muffled cat back with 3.5" double walls. I have photos of everything and am happy to either post them here for reference to other members, or send them to you to include in your first post, if you'd like. Just let me know. Don't want to clog up this thread with a bunch of photos.