The guy is part of some street racing team and while going downhill on one of the roads on Mount Rokko, we ended up stuck in traffic together at the same time... So naturally, as soon as traffic cleared up, we decided to go for it a little! :)

The encounter really starts at 13 minutes in the video... This guy is just AWESOME... Seriously, props to him, he was really fast :)

This is him, I found him thx to his jacket:

That road I tested the Version 1 WRX onto, is very popular among bikers... They are usually pretty quick, but not THAT quick downhill :D
Starts around the 13th minute mark.