For the first few miles I kept looking behind me as I rode. The bike
sounds so different. The muffler radically changes the look and sound. It's now meaner. It seems I got an additional benefit by changing to the new muffler though (besides the sound and the looks). It seems it has smoothed out the low end throttle response.
It's nowhere near as jerky as it was before, and just a tiny bit torquier down low as well.