That was forum member Diehardpoo 2014 kit running low altitude in Alaska. It was a special 2863 set up not the 2860 sold to the masses. I purchased that kit from him and it's been a perfect dialed set-up since install.
It's hard to tell from that video if it's a lean (or possibly a rich misfire) or rev limiter.
At the time of install, I made some minor clutching changes, exhaust valve spring change, intake mods, and BR9EYA plugs gapped to 0.015" and it's running 8 lbs on the gauge at 7,000 ft.
It runs perfect down to 2,200 ft as well.
We're not sure if that vid was taken with the original 2014 Silber reflash or the mid year updated reflash. Because when I got the kit, the stock map was loaded. This was/is a special hacked ECU which allows the end user to change maps.
I have a lot of goodies left to install now on the motor that have me curious.