I went with the Axle Back, one into two https://www.morris4x4center.com/dynomax-axle-back-performance-exhaust-system-dual-rear-stainless-steel-dmx-39528.html. It was perfect for me not too loud, but throaty when you get into the throttle, installed it myself with no problems. Also, FYI i just put a set of Fuel 17x9 wheels on my JK, smooth ride, just the right amount of width for me.
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