I would say, probably doable, but you gotta have some skills and some money laying around. Correct me if i'm wrong, dual exhaust or any other exhaust modification other than stock, messed with the back pressure on the engine it can be a good/bad. my .02 cent
The question is what are you hoping to accomplish with going with dual outlets? Performance? Looks? Kudos from the Redneck Brigade who considers this derigeur with their pick up trucks???
You may screw up the performance. You would need to try to match or expand backflow, but not so much that you lose performace. Looks? Purely subjective.
The majority of backpressure in an exhaust system is in the catalytic converter. Even if you were to put a straight pipe in place instead of a muffler, you'd still have plenty of backpressure. But you'd most likely get a small improvement in top end power.