Here is the exhaust setup:
Initially I disconnected the muffler and and low and behold there was an nice boxer rumble. Problem was that it droned pretty bad at highway speeds. So to remedy that I wanted to extend the exhaust further back to reduce or eliminate the drone. The exhaust is currently in the initial stages of testing. I took video of the exhaust with the muffler disconnected and then with the custom fabbed piece attached. So far, from what I can tell, the drone is has been reduced but I haven't been on the freeway yet so I won't know for sure how annoying it will be. Driving around town is fine.
Finished product....for now