I got a custom set up exhaust for a good price on my YJ... I have from the catalytic converter back is 2.5 inches. I have a free flowing Magnaflow Muffler. It's increases the sound so now I can hear my car when it is idleing, but it isn't extremely loud... My tires are louder than exhaust under normal driving conditions. I got it done at Draper Muffler and Brake on 12300 South and 700 East, it is just north of the 7-11 which went out of business... They did it exactly how I wanted it and gave me advice and threw in a pretty little chrome tip for free! They bent the exhaust up out of the way of the rear axle so I don't bend it... Happend before.
I paid $230 for mine.
If you want it from headers all the way back... It's gonna be loud, my bro has the same setup as me, only 2.5" and headers and his is way loud. It's not the muffler that makes most of the sound it's the size of the pipe in diameter and how long it is... Muffler just makes a different tone. His setup was quite a bit more expensive though...