I had read a shitload of threads on multiple forums about AIS this, and flapper valve that, and most of that stuff was like reading Latin without having pictures.
The video might not be "technically accurate", or even might be a comedy routine for highly seasoned WR owners, but for a complete newb to the WR250X, it provided a very simplistic view of the stuff that could be removed from under the seat.
When you couple the video with a dozen or so threads on a half-dozen forums, a novice can piece together a general idea of what people are talking about.
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2008 WR250X
Gearing: 13t - 48t
Power Commander 5 / PC-V
Airbox Door Removed - Flapper glued - AIS removed
FmF Q4
Bridgestone Battlax BT-003rs