Cool vid! Touge is one of my favorite forms of racing to watch. Five seconds is a huge gap though.
Best Motoring and Hot Version GT do a lot of touge. Most of their videos are in Japanese but some captions are slowly being translated. The videos on the channel are short previews/summaries of the full episodes, which are usually 90 mins and full HD (have to pay to rent; some are worth it).
Here's a link to the channel if anyone's interested:
http://www.youtube.com/user/HotVersionGT/videos