For some reason the right resonator is welded to the whole exhaust system and the left is just bolted to it. If you need the right resonator, you need to purchase the whole exhaust system.
There are two individual catalytic converters and pipes that bolt to the exhaust manifolds. The Cats bolt to the suitcase muffler and the two tail pipes are welded to the suitcase muffler, the right resonator is welded to the right tail pipe and the left resonator is separate and bolts to the left tail pipe.
Notice the bolt together flange on the left resonator and no flange on the right resonator.
I’m also interested in doing the single to dual conversion on the 15 limited.
But, when I look at the parts catalog and eBay and such there appear to be different part numbers for exhaust (i.e. the suitcase with the dual pipes and passenger side resonator). Below is what I’m referring to: