I have been scouring several forums to get feedback on a few exhaust systems that eliminate the rear muffler on a JKUR. I have had my 2014 JKUR for several months and recently decided to move towards the EVO DTD front and rear suspension and upgrade to long arms. The two pre-packaged exhaust systems I looked at and considered buying were the Magnaflow 17143 or the Dynomax 39522. The issue I had with both was the feedback on several forums for people stating it was too loud, it droned, or it sounded raspy like a civic. The rep from Dynomax on the forum, exchanged messages with me and understood my need to keep the jeep quiet for my fiancee, and was kind enough to provide suggestions on keeping the factory resonator upstream of the 14" canister muffler offered by the 39522 system. Though I truly appreciate the candor from the vendor, the more I thought about it, the more I felt that it was a shame to buy an exhaust system only to butcher it. I decided to take it to a custom exhaust shop to have a custom stainless system installed.
When I got to the shop we discussed utilizing a 6" round 14" long 2.5" inlet/outlet canister muffler with the factory resonator in place. I knew that this would scavange more exhaust energy than the canister muffler on its own. What I ended up going with is a 24" long 5x8 oval 12286 muffler where the factory resonator resides and dumping by the skid of the rear drivers side control arm (factory control arm skid location). All pipes were stainless and I was able to keep the muffler tucked up higher than the factory resonator.
The end result (dont ask for sound clips because Im honestly too lazy to take videos) is a VERY quiet exhaust system. Lets put this in context. Its louder than stock, but not much. You can definitely hear it when your foot is on the gas and you are accellerating but its not bad AT ALL. I would be surprised if anyones wives or girlfriends complained. At 60mph (on 37" tires and 4:88 gears) it doesnt drone at all. At 70mph you can hear the exhaust, but the wind noise from my light bar and the tire noise from the toyo open country's FAR exceeds the noise of the exhaust. At 80mph ~3000rpm), the exhaust noise is there but everything else is noisier. At 85mph it quiets down to a nearly imperceptable hum again.
Basically I think the longer oval muffler solved the problem many here are looking for. Unfortunately its not a kit, but the result is a clean looking full stainless system that cost me less than $300 installed. (actually $307 with tax).