So, first of all, it is not a cat. I believe Thumper is right and it was some attempt to make a resonator or built in dB killer. I was purposefully a tad rich, and after over 30 miles of riding around town doing everything short of WOT (ok, I did it once in 4th gear lol) as I am technically still within "break in" for my new rings and cylinder. The "cat" never got any hotter than the rest.of the system. Not even slightly.
My Action camera batteries are all dead. Seems they don't like sitting at 0 percent for a few months, go figure. (Oops) so all I have is this clip from warming it up after the first start. The camera doesn't translate how loud this.is, even at idle. I ended up using both baffles I mention in the video to make it tame enough to not feel horrible conspicuous, and go deaf.
Short Video:
https://youtube.com/shorts/g9ODyDyC_...ueIznQsRZu-Dyo