I'm with you wayolife. I'm not digging it either, but that may just be the old guy talking. To me, it sounds like an old rusted out exhaust with a leak, but that's purely opinion. I wasn't going to mention it, because I don't want to discourage someone who likes the way it sounds. You do you. It's your Jeep if you like the sound, go for it.
To those who are considering it. I haven't taken the exhaust of a JL, but if it's anything like the many various exhausts I've worked on, it's not hard. It's actually a good place to start to learn, because you can't really hurt anything. They can be a bit annoying at times, because it's usually dirty, and when you're trying to seal up an exhaust (not removing the muffler) you may be checking all the joints for leaks. For this project thought, that's not an issue.
To give a general idea without looking at the JL specifically.
- Locate the band clamp(s) upstream of the muffler, and loosen them.
- Put a support under the muffler to hold the weight (a floor jack works well).
- Find the exhaust hangers that support the muffler and tailpipe. Shoot a little WD40 on the hangers and rubber isolaters and pull them off.
- Lower the muffler while pulling the pipe out of the joint.
For this project you're done. 4 basic steps. If anyone needs better instructions, let me know and I'll crawl under my Jeep and find the hangers, and clamps. I won't take my muffler off, but I can point out what you need to do yours.