PK, I've of course been following along. Great job!
It has a similar sound to mine when I have my valves open about 1/3-1/2. Your's doesn't seem to have the snap that mine has at WOT or high rev blipping, but otherwise its quite similar in tone, which I guess when considering the similarity of our two mods, makes sense. I wonder if in person your's has the European wallow that is so hard to describe or pickup on mic - its my favorite part of my exhaust now.
I wonder, for future modders, why not just open one side and mod what you can from there - would take 1/2 the work that PK put in. OK, who's gunna sign up to do that?
For those that are new to my setup, here is my vid (I use two remote controllable valves to essentially dump the exhaust before the muffler sections of the exhaust which allows me to control the level from very loud to totally stock sounding):
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If would be great to meet up at some point to hear in person. Again, great job and thanks for keeping us in the loop.