I went to the local muffler shop and had them replace the stock muffler with a straight pipe and 4" chrome tip.
It cost just under $100 and it sounds very nice under full throttle...
However, under part throttle around town and under load on the highway, it is too much. Lots of drone and gets annoying.
I'll probably have a glasspack added upstream, just after the 2 into 1 section to help tone it down a little.
I've got a CAI on the way, so I'll commute next week and see if any mileage increase.
Seat of the pants dyno does indicate some improvement, and cruising RPMs are down slightly.